Factorise:

Question:

Factorise:
9y2 − 12y + 4

Solution:

We have:

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

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

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

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