Ask your own question, for FREE!
Mathematics 16 Online
OpenStudy (mathmath333):

Logarithm question

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

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

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.

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!