Question

2.3^x-3^x+1+3^x+2=72

Answer 1

2.3^x-3^x+1+3^x+2=72

2.3^x - 3.3^x + 3^2.3^x = 72
2.3^x - 3.3^x + 9.3^x = 72
 8.3^x = 72
    3^x = 9
 3^x = 3^2
     x = 2

Answer 2

.
$2,3^x-3^{x+1}+3^{x+2}=72 \\ \\ 2.3^x-3^x.3+3^x.3^2=72 \\ \\ 3^x(2-3+9)=72 \\ \\ 3^x(8)=72 \\ \\ 3^x=72\div8 \\ \\ 3^x=9 \\ \\ 3^x=3^2 \\ \\ x=2$