Solve for x

[Domzale]

Please this is an equation. Solve for x.
4(3^2x+1)+17(3^x)-7=0

 

[Dr.Peterson]

Please this is an equation. Solve for x.
4(3^{2x+1})+17(3^x)-7=0

Simplify the first power. Then try the substitution u = 3^x.