Question

Tick (✓) the correct answer:
y² + 2y − 3 = ?
(a) (y − 1)(y + 3)
(b) (y + 1)(y − 3)
(c) (y − 1)(y − 3)
(d) (y + 2)(y − 3)

Answer 1

(a) (y − 1)(y + 3)

$$\begin{gathered} y^2+2y-3 \\ =y^2+3y-y-3 \\ =y(y+3)-1(y+3) \\ =(y-1)(y+3) \end{gathered}$$