Question
Factorise the following:
$4 x^2+20 x+25$
$4 x^2+20 x+25$
✓
Answer
$4 x^2+20 x+25=(2 x)^2+2 \times 2 x \times 5+(5)^2$
$=(2 x+5)^2\left[\text { Using identity, } a^2+2 a b+b^2=(a+b)^2\right]$
$=(2 x+5)^2\left[\text { Using identity, } a^2+2 a b+b^2=(a+b)^2\right]$
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