Find the set of values of x for which y is zero in

the equation y = (x + 2) (2x-2)

{ - 2, 1 }

Step-by-step explanation:

To determine the values let y = 0, that is

(x + 2) (2x - 2) = 0 ← in standard form

Equate each factor to zero and solve for x

x + 2 = 0 ⇒ x = - 2

2x - 2 = 0 ⇒ 2x = 2 ⇒ x = 1

The set of values are { - 2, 1 }