Question

Mostre que 2^n + 2^(n+1)=3 x 2^n

Answer 1

2^n+2^(n+1)=3x2^n
2^(n+1)=6^n-2^n
2^(n+1)=4^n
2^(n+1)=2^2n  corta as bases
n+1=2n
1=2n-n
n=1

Creio que esteja certo :)