Question

Se 2x+2−x=10 então 4x+4−x

Answer 1

2^(x) +2^(-x) =10
[2^(x) +1/2^(x) ] =10²
2^(2x) +2*2^(x) * 1/2^(x) + 1/2^(2x)=100
2^(2x) +2 + 1/2^(2x)=100
2^(2x) +1/2^(2x)=98
4^(x) +4^(-x)= 98

Letra D