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OpenStudy (mathmath333):
Logarithm question
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OpenStudy (mathmath333):
\(\large \color{black}{\begin{align}& \text{solve}\hspace{.33em}\\~\\& \log_{2}(9-2^{x})=10^{\log_{10}(3-x)}\hspace{.33em}\\~\\
\end{align}}\)
OpenStudy (mathmath333):
@freegirl11112
OpenStudy (mathmath333):
@freckles
OpenStudy (anonymous):
hi I dot know this yet sorry
OpenStudy (mathmath333):
mistyped ur name was calling frekels
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OpenStudy (freckles):
\[\log_2(9-2^x)=10^{\log(3-x)} \\ \log_2(9-2^x)=3-x \\ 2^{3-x}=9-2^x \\ 2^{3-x}+2^x=9 \\ 2^3 2^{-x}+2^x=9 \\ 8 \cdot 2^{-x}+2^x=9 \\ \text{ multiply both sides by } 2^x \\ 8 +2^{2x}=9 \cdot 2^{x}\]
OpenStudy (mathmath333):
i didn't understand the second step \(\log_2(9-2^x)=3-x\)
Nnesha (nnesha):
what happened to 10^log ?? :o
OpenStudy (freckles):
sorry log_10(x) and 10^x are inverses
OpenStudy (freckles):
\[10^{\log_{10}(3-x)}=3-x\]
when 3-x>0
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Nnesha (nnesha):
mhm oh okay thanks:=)
OpenStudy (freckles):
and I'm so sorry but I have to go
someone is waiting on me
OpenStudy (freckles):
hey @mathmath333 were you able to finish
OpenStudy (freckles):
you have a quadratic in terms of 2^x
OpenStudy (mathmath333):
yep o got it.
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