Question

2 la puterea x+2 +2 la puterea x = 40

Answer 1

[tex] 2^{x+2} + 2^{x} =40

2^{x} * ( 2^{2} +1)=40

2^{x} *5=40 [/tex]

$2^{x} =40:5 2^{x} =8 2^{x} = 2^{3} x=3$