Respuesta :

gmany

Answer:

A. 3

Step-by-step explanation:

The polynomial y = (x + 4)(x - 2)(x + 7) has 3 roots.

y = 0 ⇒ (x + 4)(x - 2)(x + 7) = 0 ⇔ x + 4 = 0 ∨ x - 2 = 0 ∨ x + 7 = 0

x + 4 = 0   subtract 4 from both sides

x = -4

x - 2 = 0      add 2 to both sides

x = 2

x + 7 = 0      subtract 7 from both sides

x = -7