Question

Sendo 2 elevado a x igual a b, então 2 elevado a -2+2x vale?

Answer 1

$2^x=b\\\\ 2^{-2+2x} =\\\\ 2^{-2} \times 2^{2x} =\\\\ 2^{-2} \times (2^x)^{2} =\\\\ \frac{1}{4} \times (b)^{2} =\\\\ \dfrac{b^2}{4}$

Espero que tenha entendido!