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)
$y^{2}+2 y-3$
$=y^{2}+3 y-y-3$
$=y(y+3)-1(y+3)$
$=(y-1)(y+3)$
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