Question

3^x+2      + 3^{2   = 90}

Answer 1

3^x+2      + 3²   = 90

3^x+2      + 9  = 90

3^x+2  =90-9

3^x+2  =81

3^x+2  =3²⁺²

=>x=2

Answer 2

\(3^{X+2}+3^2=90\)

\(=>3^X.3^2+3^2=90\)

\(=>3^X.9+9=90\)

\(=>3^X.9=90-9\)

\(=>3^X.9=81\)

\(=>3^X=81:9\)

\(=>3^X=9\)

\(=>3^X=3^2\)

\(=>X=2\)