2^x+2^(x-1)+2^(x-2)=56

Question

2^x+2^(x-1)+2^(x-2)=56

Answer 1

2^х•( 1 + 0,5 + 0,25 ) = 56
2^х = 56 : 1,75
2^х = 32
2^х = 2^5
Х = 5

Comments

Большое спасибо!