Answer:
[tex]x = 20000000[/tex]
Step-by-step explanation:
Recall the power property of logarithms which states:
[tex]log(a^n)=n\,\,log(a)[/tex]
to re-write [tex]2\,log(4)=log(4^2)=log(16)[/tex]
and then use the product and quotient rules of logarithms:
[tex]log (A*B)=log(A)+log(B)[/tex]
and
[tex]log (\frac{A}{B} )=log(A)-log(B)[/tex]
to rewrite the combination of logarithms on the left of the equal sign as a single logarithm:
[tex]log(x)+log(8)-2\,\,log(4)=7\\log(x)+log(8)-log(16)=7\\log(\frac{8\,x}{16}) =7\\log(\frac{x}{2}) =7[/tex]
and now re-write this equation in exponent form to get rid of the logarithm:
[tex]10^7=\frac{x}{2} \\2\,\,\,10^7 = x\\x = 20000000[/tex]
