Question

please help fast urgent

Answer 1

$\rm{(5/7)^3\times(5/7)^{-6}=(5/7)^{2x+3}}$

$\longrightarrow\rm{(5/7)^{3+(-6)}=(5/7)^{2x+3}\quad...\:Since\:a^m+a^n=a^{m+n}}$

$\longrightarrow\rm{3+(-6)=2x+3\quad...\:Comparing\: the\: Bases}$

$\longrightarrow\rm{3-6=2x+3}\longrightarrow\rm{-3=2x+3}$

$\longrightarrow\rm{2x=-3-3=-6}$

$\longrightarrow\rm{x=-6/2=-3}$