Question

Which of the following is a zero for the function f(x) = (x + 3)(x - 7)(x + 5)?

Ox= -7
Ox= -3
Ox= 3
Ox=5
in

Answer 1

x = - 3

Explanation:

to find the zeros equate f(x) to zero , that is

(x + 3)(x - 7)(x + 5) = 0

equate each factor to zero and solve for x

x + 3 = 0 ⇒ x = - 3

x - 7 = 0 ⇒ x = 7

x + 5 = 0 ⇒ x = - 5

the zeros are x = - 3, x = 7, x = - 5

the one from the list is x = - 3