Question

( 7X +2 )^-1=3^-2

 

Answer 1

\(\left(7x+2\right)^{-1}=3^{-2}\)

\(\Leftrightarrow\)\(\frac{1}{7x+2}=\frac{1}{9}\)

\(\Leftrightarrow7x+2=9\)

\(\Leftrightarrow7x=7\)

\(\Leftrightarrow x=1\)

Answer 2

\(\left(7x+2\right)^{-1}=3^{-2}\)

\(\Leftrightarrow\frac{1}{7x+2}=\frac{1}{9}\)

\(\Leftrightarrow9=7x+2\)

\(\Leftrightarrow7x=7\)

\(\Leftrightarrow x=1\)