Factorise:
Question:
Factorise:
9y2 − 12y + 4
Solution:
We have:
$9 y^{2}-12 y+4=(3 y)^{2}-2 \times 3 y \times 2+(2)^{2}$
$=(3 y-2)^{2}$
$\therefore 9 y^{2}-12 y+4=(3 y-2)^{2}$