Question

What are the zeros of the function f(x)=(x+5) (2x-8) ?

Answer 1

x = - 5, x = 4

Explanation:

To find the zeros set f(x) = 0, that is

(x + 5)(2x - 8) = 0

Equate each factor to zero and solve for x

x + 5 = 0 ⇒ x = - 5

2x - 8 = 0 ⇒ 2x = 8 ⇒ x = 4

Answer 2

X = -5 or x = 4

Explanation:

F(x)=(x+5) (2x-8)

When f(x) = 0

0 =(x+5) (2x-8)

Thus;

x+5 =0 or 2x-8 = 0

Therefore; x= -5 or x = 4