Factorise the following: 9 y^2-66 y z+121 z^2 - Vidyadip

Question

Factorise the following:
$9 y^2-66 y z+121 z^2$

✓

Answer

$9 y^2-66 y z+121 z^2=(3 y)^2-2 \times 3 y \times 11 z+(11 z)^2$
$=(3 y-11 z)^2\left[\text { Using identity, } a^2-2 a b+b^2=(a-b)^2\right]$

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