Question

3^{x} +2*3^{x+1} +3^{x+2} =16

Answer 1

3^(x)+2*3^(x+1)+3^(x+2) = 3^(x)+2*3*3^(x)+9*3^(x) = 16*3^(x)
16*3^(x)=16
3^(x)=1
x=0