Question
Factorise:
$p^2-10 p+25$

Answer

$p^2-10 p+25$
$=(p)^2-2 \times p \times 5+(5)^2$
$=(p-5)^2$
$\left\{\because a^2-2 a b+b^2=(a-b)^2\right\}$

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