Answer:
x = - 7, x = - 4
Explanation:
To factor the quadratic
Consider the factors of the constant term ( + 28) which sum to give the coefficient of the x- term ( + 11)
The factors are + 7 and + 4, since
7 × 4 = 28 and 7 + 4 = 11, hence
(x + 7)(x + 4) = 0
Equate each factor to zero and solve for x
x + 7 = 0 ⇒ x = - 7
x + 4 = 0 ⇒ x = - 4