Question

Factorise 4y
$4y {?}^{2} { - 12y + }9$
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Answer 1

$4 {y}^{2} - 12y + 9 \\ = 4 {y}^{2} - (6 + 6)y + 9 \\ = 4 {y}^{2} - 6y - 6y + 9 \\ = 2y(2y - 3) - 3(2y - 3) \\ = (2y - 3)(2y - 3)$