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Soloha48 [4]
3 years ago
13

Consider f(x)=4-e^x

Mathematics
1 answer:
Gennadij [26K]3 years ago
3 0

\bf \textit{Logarithm Cancellation Rules} \\\\ log_a a^x = x\qquad \qquad a^{log_a x}=x \\\\[-0.35em] \rule{34em}{0.25pt}

\bf f(x) = 4-e^x \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{when it crosses the x-axis, y = 0~\hfill }}{0 = 4-e^x\implies e^x=4\implies \ln(e^x)=\ln(4)\implies x=\ln(4)}~\hfill \boxed{(\stackrel{x_1}{\ln(4)}~~,~~\stackrel{y_1}{0})} \\\\[-0.35em] ~\dotfill\\\\ A)\\\\ \left. \cfrac{df}{dx}=0-e^x\right|_{x= \ln(4)}\implies -e^{ln(4)}\implies -e^{\log_e(4)}\implies -4 \\\\[-0.35em] ~\dotfill\\\\ B)\\\\ y-0=-4[x-\ln(4)]\implies y=-4x+4\ln(4)

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I’m pretty sure you do need to subtract 30-8.
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