Question

Alguém poderia me responder a resposta de 5x ( x - 3 ) (x +4)

Answer 1

5x ( x - 3) ( x + 4) =
5x ( x² + 4x - 3x - 12 ) =
5x ( x² + x - 12 ) =
5x³ + 5x² - 60x

Answer 2

5x ( x - 3 ) ( x + 4 )
5x² - 15x ( x + 4)
5x² - 15x² - 60x = 0
- 10x² - 60x = 0  - ( - 1 )
10x² + 60x = 0
x ( 10x + 60 ) = 0
x = 0
10x + 60 = 0
10x = -60
x = - 60/10
x = - 6