Question

\[\log _{10}x+\log _{10}(x+3)=1\] how would I do that?

Answer 1

start with
\[\log(x(x+3))=1\] then
\[x(x+3)=10\] and
\[x^2+3x-10=0\] etc

Answer 2

\[e^{-7} e ^{3}e ^{-9}\]

Answer 3

I think I need to add all of the exponents, but I am not sure what to do after that.

Answer 4

HELP PLEASE