Question

Quero saber o resultado dessa conta 1/4×-3=21 à outra é 2/8×+4=36

Answer 1

$( \frac{2}{8})^x+4=36\\ \\=( \frac{2^{:2}}{8_{:2}})^x=36-4\\ \\=( \frac{1}{4})^x=32\\ \\(2^{-2})^x=2^5\\ \\2^{-2x}=2^5\\ \\ \\ -2x=5\\ \\x= \frac{5}{-2} \\ \\x=- \frac{5}{2} \\ S=\{- \frac{5}{2} \}$