Factorise the following:
$4 x^{2}+20 x+25$
Factorise the following:
$4 x^{2}+20 x+25$
We have,
$4 x^{2}+20 x+25=(2 x)^{2}+2(2 x)(5)+(5)^{2}$
$=(2 x+5)^{2} \quad\left[\because a^{2}+2 a b+b^{2}=(a+b)^{2}\right]$
$=(2 x+5)(2 x+5)$
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