Question

решите уравнение:
2^(x+2)-2^x+2^(x+1)=20

Answer 1

2^x*4 - 2^x + 2^x*2 = 20
2^x( 4 - 1 + 2) = 20
2^x *5 = 20
2^x = 4
2^x = 2^2 ==>
x = 2