Question

-x2+4x=0. equacao de 2 grau

Answer 1

- x² + 4x = 0
x ( - x + 4) = 0
x = 0 ⇒ x ' = 0
- x + 4 = 0
- x = - 4 (-1) 
x = 4 ⇒ x" = 4

S = { 0 e 4 }