Factorise the following:
$9 x^{2}-12 x+4$
Factorise the following:
$9 x^{2}-12 x+4$
We have,
$9 x^{2}-12 x+4=(3 x)^{2}-2(3 x)(2)+(2)^{2}$
$=(3 x-2)^{2}\left[\because a^{2}-2 a b+b^{2}=(a-b)^{2}\right]$
$=(3 x-2)(3 x-2)$
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