Question

-4x ao quadrado + 9x =0

Answer 1

- 4x² + 9x = 0
x(- 4x + 9) = 0

x = 0

- 4x + 9 = 0
- 4x = - 9 (-1)
4x = 9
x = 9/4

R.: x = 0 e x = 9/4