Função logarítmica
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PiR2 :: Matemática :: Álgebra
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Função logarítmica
(UFMG) Na figura a seguir, temos o gráfico da função: f(x) = log2(1/ax + b)
![Função logarítmica 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3JxvDWoMVwBAC1dDw7+NBYKzFg4tEPxpYw119H0cQQCgOW+0AwcO0Js83BRfNOmVVVdX07XXXkPizoGUWAUAtMTqb6p2WSB4lY+7+9qMfPrmS/m0JL+dJPZTEoBmSkJLM5WXl9OkSffT1m1bKZ0XBObOnUvTpr2oemyWVoTColYAQItassTc0OYP0e/XVSs3jp/zAcWFbX2qIQCa8/bo7++ntLQ0euutlbRs2TJav369ct1wviWocbQCANpoRTR9LkPPffU99P3XitVGkHfzLrcyvwagJcZgfX191NLSTI2NjdTZyS41PJ+GlHgFALTE28B0C2S77mmZzco3TVY+15R00HPPT6UTTjjedBnIaJ0CArIuONRGFHRgYIACgYDjriwAWkRz6Pui+KZds6pCbQT5i2VlNOGxpwC0BJlL4jk3bNiQoNr1rtbb1ka7d++mqqoq1YOVYboTSQug1dTUEC5zGlSzVovTCugf/raNvvz4Vjr7pokKaNDPnH5W6nT//ffRI488gu9uhN/vDg7cv+aaX9LEiRNo0aKFlMGxripErNtHoVDINrZpAbRJkybxqhEusxrcfc999IPrxtG3r76NjvvZRQpo9953PzR0+Dt0ySX/qvzPzNotlfJJ8P7JJ59Ep5/+Azr//PPouut+S5MnP0Tr31tPTU1NyQ20iRMnMslxRaPBuLvG07X/9Rc67qf/ooB25R9vpwkToGE0Gsab9+KLL6LLL78M390Iv90//vFm9b086aQT6bTTvkfnnXcu3XDDf9Czzz1LpaUlyQ008evBFb0GO3OK6Owbx6svzuVzdtGBglLo6OB36Y47/kL33XcvNI+gucwtnnXWmSS92Ntu+2+aNWsW7dixXWnl9x95O6x4SafFkDPeD5Gq9wf4ZKiJjz2tgPbNmQXK+XZ0rGeqauPE55469Xl6+eVZTlTlujoqKyvpueeeo40bN6pY1zZeJBBXF7sD+AE0131VRjbYcNv47Au59OPXS9hXrZsGwoM9R2bHMwsVyMvLo6KiIgtLTJ6ixGWjoaFBhYYZPnoCM+Nvuz4pgGaXsg6VazjW/nRhKTvc5tJ1ayupqtOZJXKHPqK21YgrggSmI0VWwHA6Nt5tb29X8a/GczseATQ7VHWwTANobxR00PGvFKgTo+QU9s7AxwHsDjYnpaoC0MY2tww316xeTaKTBPGv5r9lrtzOBKDZqa4DZRtA6+wL0aNpDQpox84uoIV5XpLIAiT7FBCfNvGtQoqsgMyjPfTQ/1JOTg7t2ZNGc+bMoe7u7siZLXoVQLNIyEQVYwBN5idqugL0H+9U0+d46HnmghLaXeujgUO7ciSqfclar+gt2wjJNtxIkRUQB9qtW7fSgw8+QA8/PJnKysqwKBBZKrxqKGAATZ7LDreZDT10/pKh+TQJkSpr53g6IzMeLVNAgCZnCciFdGQFyjweGjduHN11112OnLuAHtqRbeGKd8KBJg0O8jDz7eIOOnFOkQpiv3dbPXn58GIkaxUA0D5Zz27eAPP11xfQu+++S888+wyt5dhXWf20MwFodqrrQNmjgSZV+gIhmrK3SW0IecysApqb00a97LOGZJ0CANona7lr506aP/81tSNJaWmpmk/zcI/NzgSg2amuA2VHApr82Oq7++nm92ro8y/m0hl8vueWSt+YJ7A70NSkqkI0ltPScWL6kc26jefPZOFEtJLthHbt2kXZNs85AmhHtocr3okENGm4fIlymnvpgmUe+tyLeXTx8jLKbvSz0y1m1KwwrOjb0dGhLivKS8YyRJ9wR1px3ZBzGOxMAJqd6jpQ9pGAJlXLWQTryzrp9NdK6IvT8uh6XgH1dMimew40LAWqkB9r+A82BT6y9h8RQNPeRGM3cCygyZ3+4CDNz/XyIkEhfXV6Pt25pY4aeTiKFL8C4jAqF5I+CgBo+tgippZ8EtCk0HZ2un0qvYmOeqlAXU/ubRxxFF5MFeMmtRur7MiKpI8CAJo+toipJWaAJvM9Dd1BGs8Hq3yFe2nSW1vAvTZ/EOFRMYnON4mm4lgrF5I+CgBo+tgippaYAZoULD/AsvY+NY/2BV4k+BFHErxX3knYbigm2ZWecKyNTTs77wLQ7FTXgbLNAk2aIpEEWY29asXz8wy1C5Z6KJ2Pxgthv6GoLSX/QQBoUctm+w0Amu0S21tBNECTlgQZXluquuishSX0BfZRk/Aoce9AzGd0dhKgZXDYk1xI+igAoOlji5haEi3QpJI+jhpYVthO33u1mL48Xdw5qqigtQ9Qi8ICArR83uBRLiR9FADQ9LFFTC2JBWhSURfvlzaHQ6JOnltEX52Rr6IKSjmQHZtzmDODAE0OGpYLSR8FADR9bBFTS2IFmlQmQevTMlt4Y8hC+geG2p831VJlRz+gZtIScKw1KZSD2QA0B8W2o6p4gCa9jBZ/kJ5kH7VjXi6gb8zMpwnbGqjG149oAhPGgmOtCZEczgKgOSy41dXFAzRpi0CtsSdID++up2/xzhzfYufbB3kL7waOJkCE1NjWqqioILmQ9FEAQNPHFjG1JF6gSaUCtTpfgCbtqONeWgHJlkN/29NAzdx7A9Qim0U0y8zMVFfkHHg1EQoAaIlQ3cI6rQCaNEd+oJWdARXr+TWeT/sOn0vwzL4maurB8DOSuUQv+KFFUiaxrwFoidU/7tqtApo0RBxvPbzSeev7NfQ1nk87gUOkntjLw081p4a+WrixALRwNfT5G0DTxxYxtcRKoEkDBGpFbX30J4ba13n4KUfjPbyrQQ1J4dLxsYkEaBkZGer6+FX8lWgFALREWyDO+q0GmjRHogaKvX00blMdfZN7at/mFdAHd9ZTVRdcOgxzCdAKCwqosLDQeAmPGigAoGlghHiaYAfQpD3SUxNH2/Fba9TqpywUTGSXDvFTw663Q3OOPj5j0u5zJuP5bqTivQCay61uF9BEFoFaeUcfTfqgno4+5NJx15Z6testYj+HoCY9NSR9FADQ9LFFTC2xE2jSIIFaNR9g/BD7psnQ8ygG220cUSDzbKEUn1STI9nsPpYtpi9FCt8EoLnc+HYDTeSRXkgdz589vqeRjptdSN94KZ9u4ROlZJeOAJ8DmopJNJEj2ew+li0VtY3nMwNo8ainwb1OAE0+pvyAJXrgqfRmtePtNzii4NrVlbSzxqfOLdBACkebIHrs379fXY5WjMrGVABAG1Me/d90CmiihPyImzhMakZWizpJShxwL+Rj8tZ6uqiTd+9IpSRawLFWP4sDaPrZJKoWOQk0aZj8kNt4l443Ctrp3MWlauuhny4qpVcPtlFLb5Dn3KJqvmszA2h6mg5A09MuplvlNNCMhnX1D9D7FV102cpytfWQbBb5ZHqj2qkjFVZABWhwrDW+Dfo8Amj62CKmliQKaNJY2flWziT4/bpqtVBwPC8Y3Lu9gUq8AbXVd0wfyCU3CdCKiorU5ZImp0QzATSXmzmRQBPp5IyCvJY+FdQubh3ir3Yzr4AeaPQn9WKBAK2np0ddLv8KJVXzATSXmzPRQBP5ZIhZ0RGg/2O3ju/OZbcOjgG96q1yeocXC2RX3GSdV8OOtfr9eAA0/WwSVYt0AJo0WHosjezWMfvDVvrx6yUc2J5PP+HFgukHWtgxtz8pnXD9fu6F8oWkjwIAmj62iKklugBNGi9Q8/aFaE1pB13JPbRvsgPuybwF0V1b69kJ10+9POeWLEk+a3FxsbqS5TMlw+cA0FxuRZ2AZkjpDw7Qfp5Dk0NXjuONIo+eVUi/5PM/5aT2DgaewMDtST4DHGv1syKApp9NomqRjkCTDyBxnmUc2P7c/mb60QIZghbQz3gI+nJ2K9Xydt9ud+0QoMGxNqqvqiOZATRHZLavEl2BJp9YfvQt/hCtKumgS1eUK9eOU+YV8clSdZTb0uvqVVAAzb7vdDwlA2jxqKfBvToDzZCnh4eg4q92G++CK0NQOTLvN2sqVciUHKPnxt4ahpyGdfV6BND0skfUrXED0ORDib+ah4egT+9rpjPml9BRHNx+9sJS5eqR39rnut6aAK2kpERdURsNN9imAIBmm7TOFOwWoIkaAoF29kuTxYFf804d32YnXHHEvYLDp94q7lSB727aYw37oTnzHY+mFgAtGrU0zOsmoIl8AjVx35ANIp9gR1xZMJAT27//WjH99YMGtcdaT9Ad7h3yWeRC0kcBAE0fW8TUErcBzfiQMm/WyvNnG1RvrUr11uTk9stXVtBKl/TW5DyBbg5/QtJHAQBNH1vE1BK3Ak0+7Me9tQA9ubeRfiy9NXbGPY137vgrn2MgO+L6eFcPXXtBBXzqk1xI+igAoOlji5ha4magGR9Yemtth3prv107srf2el67OtFddvbQKQlksX2QThYZaguApp9NompRMgBNPrDRWytuC9BTh3prR83i0Km5RXx+QTVtquxin7YgBTWJdJf2wrE2qq+qI5kBNEdktq+SZAGaoZDRW5PNI29eX00nMdCO4mHomRzw/vDuRsrmkCrZ7ltOo0pkAtASqf6R6wbQjqyNK95JNqCJ6AILGWJWdgZoQZ6XLucoA3HGPeblQrp4eZkKnyrlk91lNTRRXJM2SixnZmamK74nqdJIAM3llk5GoBkmkV5YVyCkFgfkCD1xxJWV0BNeKSSZa3uzqINqeGuiXgGbcZNDjwK0srIyqqiocKhGVGNGAQDNjEoa50lmoInsAg5xtm1lh9zt1T4at7mWV0GLFNj+kR9v3VBD68s6qc4XdBxs/f39OGhYs98GgKaZQaJtTrIDLVwPOdS4ztdPq4rb6fq11XQi99Qk0uD0+cX0P7xVkYCt1kGwyY61AlwkfRQA0PSxRUwtSSWgiUACENlvzdMeUEfnXf12hRqCHnMIbP+9kcHmcabH1tXVRd0+X0x2w032KACg2aOrY6WmGtAMYYfm1waokAPb5+a0kQG2o3nx4AccRiVgW8dgq+UenZpjs7gjJWDNzc2l/Lw8o0l41EABAE0DI8TThFQFmqGZuHl0sRuHATbZGVcWDQRs3+eIA5ljU2DjxQPp2Vnl7iFAEz+0DL6Q9FEAQNPHFjG1JNWBZohmgE2C3ufxKe6/XFVJxzPYZCj6Awbbf/HReiuK2vnM0D61DXi8DroG0ARqSPooAKDpY4uYWgKgjZRtgHtO0mMTsL3KYLuGtymSxQMB26m8W+6vuAc3PbNFnXnQ3BNU/m58S9QJQItaMkduANAckdm+SgC0yNoOg417ZAtyvfTvayvVEFQOQ5YT3v9pqYfu51PeN3JEghyz181B8NLLM5sEaOJUC8das4o5kw9Ac0Zn22oB0MaWVsAmO3aU8265Mpd2Nx+p9/PFHt4KvJCO5cgD2T33DxxitYiD4PNae9XByIGQ7HM2drkCtKqqKnWNnRPvOqkAgOak2jHWJT+eYDAY8W4ALaIsh70oiwGysWRDd5DSanvo2Yxm3im3gk7ic0Ol13bynCJ1kMtT6c3swNutem0ydO3nrcMjsc2wyZHsclgD8IIjCgBojsgcXyWtrS1qq5pIpQBokVQ58msCIoGUHIhcwC4fi/O99J/cQ5Odc49lsH2He25nLyyhG9dVc8xoC+1m+EkUgvTy5FyE8CSOtXIh6aMAgKaPLSK2RMJrFi9eRNdd99uI7wNoEWUx9aLMmcncmcyhbarw0QO8Bfi/LPOoXpsMR2Ux4Rw+S/RmXiGVBYb0er/q4ck9skra2dmpLlOVIZMjCgBojsgcWyXSm8jOzqapU6fSxRdfFLEQAC2iLFG9KDrL7h7NfIZoVpOfFnGv7TYOpTqX59rEp02GpCfykPT8JR768/u13KtrpwO8jdGe/dmU9eGHqufGRSBpoACAliAjyNxLb29vxMtoktfrpSlTpqij0i655BLjZfUo+9l3dHTQlCen0AknHK/+lufy4zSS1NEfCIy8uMcXniLlGT0vZCaP9CRH1zW6nNHvy/NQKDTcHDUcHN1efj4wMDCcR4Z4kcoxkyd8eCj5I5UT5HhR6YFJzOju6i56KaOB/n21h86Yl0ffmgtT5+IAAAlYSURBVHGQvjUzV206eeGyMnp0+TZavHEX7a3r4V0/AtTOw1iZp4tmtXT4g+EPSxQA0CyRMfpCZNuZ7du3R7ykNIHBihUraNWqVepHf+mll46oZOPGDTR37ly66Q83KaDNnTdXPQ//YdfV1VFRYeGIS86SDE/V1dUj3pf8si1OeKqoKD8sj9wXnqTc0XVJ/UaSSfnR78vzpuZmIwsJFCPlaWtrG87j9/sj5uns7BjOI7CPVE5P2IEmHe3tEfPI0XSSBK4NTc2UkZNPmzJyaM7mTPrLynS6YHYabzZZzE67RXTjvC10/fwdqid3w7oqeobPHJUA+XxeLW1iHzeZd5P5uii8QVTd+Cd2BQC02LWL606B2SOPPBLxkoLzOEZwypQnqJl/8AI36aHJowGsRYsW0uTJk+maa69RQHv0sUfV8/Aej8fjGd4m2tgu+sCBAyPaXVRUdFienJycEXlycw8elqeQYRSepFyjDuNR6jeS9I6M18MfK9n1wUgCk/D3jL/DwSiwMl4Pf5SFEyO1t3spPT39sHzSgzVSU2PjYe9LeQJMI9XW1g7n2bUnnd7fuYdWb02jLZWd9FJWK03aUERXL89Xc23Hzi5UkQlyHN9lfM7o3VvraD77v+3iRYVyDqSX7Y+6OfRqCHAf96KNuvBojQIAmjU6Rl2K7NQgP9RIlxT2+OOP05tvvqnAlp+fTxdeeAHJowxDJXm9bVRfX6/yyZBT/pYrfMgpgJBeyehLFXDon74+3vl1VB4ZCocneT46j9wXngQEo/MYvR3JJ+0a/b48l16ZkQR6n5RHgB4pj8DeSKFQkAR8o/MZ/xlIPsk/+n15Hj4slbaF55Ey5epjMHXw8LKeh5np9T30OoPrL5vr6F9XlNH3GGjf4Xk38XOT7cNlUeFXHK0gZ44u4rm3D2q6eaeQPp6vC6qIBpm7kwUGIM6wXnyPAFp8+tlyt/z4Z8yYQQsXLqSlS5fSMr5+/vNzaNmyZYcNB41FgXCQjdUos/nGKkPH98I/l/wd/tyq9hrlhj9Kj0uGluLfltvSS+96uugZ9nG74d0qOpcXEb47t1ABTqIT5MCXn/CuuxJAP3F7Pc3ObqUNZV2UxQsMNb6hXpyUNQw5/hxI0SkAoEWnlyO55QfT2to6fLXx31dddRXJXNLonpEBNEcahkrGVEAWA2RRQHzcqrn3tpd7bxIQ/2haE4deVdH5b3hUPKn4ukngvDj1yuaUssBw/bpKenBnowrTkgNiMhlyFRzdID05WWzw8zbjgUO9Oat2DBnzw7j0TQBNU8OF9wLk7+nTp0fsdQBoehpQbCaOuD08PJX5syo+8GVfg5/eLu6gJ/Y2K2fei98sUw694hIiw1SBnPTizmAn339eWsZD1Qq6Y0sdPcc9vhV8fsKWSp8CnYfjU6VH2MblSjSDwE716rg+2a5c6k7VBKC5wPLyBZXeWaQvKoDmAgNyEw3ACXwERLXszHuQh6ibGVLzD3rpAe6d/e6dKtVbk6iFkxhyAji5TuSenOwUIifLC+hkM8tbeJ+3ybsaVTTDSoakOAaL+4gMeyu5ZyfAa+F6vHzJsX/iiiIbXQr4ZJgssBX4Sa9SenzJgkAAzR2/B/WDANBcYiwTzRRbCkxkGCnzZi3s1CvH9mU19So4LSlo455cE93Gjrz/xqum5/F83Om84CCgE2dfAZ08nsRzdKdwr04geO7iUrqEj/yTRYib19fQfTsa6G97mmgmr8guzmuj1aWd9D4f2LyTV14zuLf4YbNfhX952nupmv3u6hmCjexuIsNcuaRn6bbhLYBm4suncxb00HS2TnRtE8hJr0l6UdKjkp6cOPiWeHspnXtfG8q7aGmBl57f30ITttXT9dyju4xXVs/jiAbpvQnYZF4uHHgynJXXvsvvnTqvmH64oJh+tsij5vMu4jNOL+cA/V++Xc7HAlbSjRzTeisD9A5esR2/rY4m8cqsv/9jx+foPk1icgNoidHdsloBNMuk1LIggZz0kmSIaICuvW9AOe7KwkMBO/HuY9jJ0HVVSScPX1vpaXbwld6ZDEt/w721K1eW0S944UFCuc5k8J3GO/iezJATt5ITpac3DMGhYa48F8dhAaMv8LE7jJYCjWoUgDZKELc9BdDcZjHr2msMWwV2MnSV+TkZvsq8mcSl1vEQUhYjirmHl81D2T081JSFhXXsWiLzbku4tzf3wxZ6MbNVDW8f4jk5cSeRhQgZ6goQA2Ghada13L6SADT7tHWkZADNEZldW4nRw5OhrCwGCPjEtUTgJ8NaWSVtZwDK8Fbm8SRkS+bRZD5NgCj3uykBaG6yVoS2AmgRRMFLUSngNmiN9eEAtLHUccF7AJoLjIQmOqYAgOaY1PZUBKDZoytKdacCAJo77TbcagBtWAr8AQUIQHP5lwBAc7kB0XxLFQDQLJXT+cIANOc1R436KgCg6WsbUy0D0EzJhEwpogCA5nJDA2guNyCab6kCAJqlcjpfGIDmvOaoUV8FADR9bWOqZQCaKZmQKUUUANBcbmgAzeUGRPMtVQBAs1RO5wsD0JzXHDXqqwCApq9tTLUMQDMlEzKliAIAmssNDaC53IBovqUKAGiWyul8YQCa85qjRn0VAND0tY2plgFopmRCphRRAEBzuaEBNJcbEM23VAEAzVI5nS8MQHNec9SorwIAmr62MdUyAM2UTMiUIgoAaC43NIDmcgOi+ZYqAKBZKqfzhQFozmuOGvVVAEDT1zamWgagmZIJmVJEAQDN5YYG0FxuQDTfUgUANEvldL4wAM15zVGjvgoAaPraxlTLADRTMiFTiigAoLnc0NOnT6dTTz3F5Z8CzYcC1igAoFmjY8JKWb16Nd1yyy0Jqx8VQwGdFADQdLJGDG3p6uqi2traGO7ELVAg+RQA0JLPpvhEUCBlFQDQUtb0+OBQIPkUANCSz6b4RFAgZRUA0FLW9PjgUCD5FADQks+m+ERQIGUVANBS1vT44FAg+RQ4DGgDH31EwYHBhH5SJ9rQ3R+05DP2BIPk7e2nQGiAeoOhEWUOspahwZFaBvm55A1Pcp+3N6AuaZfchwQFoED0ChwGtKbuXsppbI++JAvvcKINr2Z54m6xgGh5fiVN3VtIWQ1ttNFTP1xmaPAjquvyU2Fr5/Br8kedz09p1c0jXttT00xTdufSE7ty6Y3cCqrnPEhQAApEr8D/A1LWYEtYuZoEAAAAAElFTkSuQmCC)
Qual o valor de f(1)?
Gabarito: -2
Última edição por julia.midori em Seg 07 Jun 2021, 17:12, editado 1 vez(es)
julia.midori- Iniciante
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Re: Função logarítmica
Sua expressão está escrita errada:
f(x) = log2[1/(a.x + b)]
Para x = 0 ---> f(0) = 0 ---> 0 = log2(1/b) ---> b = 1
Para x = 5 ---> f(5) = -4 ---> -4 = log2[1/(5.a + 1)] ---> 1/(5a + 1) = 2-4 --->
1/(5.a + 1) = 1/16 --> 5.a + 1 = 16 ---> a = 3
Complete
f(x) = log2[1/(a.x + b)]
Para x = 0 ---> f(0) = 0 ---> 0 = log2(1/b) ---> b = 1
Para x = 5 ---> f(5) = -4 ---> -4 = log2[1/(5.a + 1)] ---> 1/(5a + 1) = 2-4 --->
1/(5.a + 1) = 1/16 --> 5.a + 1 = 16 ---> a = 3
Complete
Elcioschin- Grande Mestre
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Re: Função logarítmica
Obrigada, mestre!
julia.midori- Iniciante
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Data de inscrição : 19/05/2021
Idade : 20
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