Question

4+x(x-4)=x
Ajudem eu!!

Answer 1

4 + x(x - 4) = x

4 + x² - 4x - x = 0

x² - 5x + 4 = 0

(x - 4)(x - 1) = 0

x - 4 = 0 → x' = 4

x - 1 = 0 → x" = 1

S = {1, 4}