Factorise
$169 x^{2}-625$
$(13 x+25)(13 x-25)$
Expand
$(2 x+5 y)^{2}$
Zero of the zero polynomial is
$\left(\frac{2 x}{3}+\frac{3 y}{4}\right)^{2}$
The following expressions are polynomials? Justify your answer:
$\frac{1}{5 x^{-2}}+5 x+7$
On dividing $x^{3}+a x^{2}+19 x+20$ by $(x+3),$ if the remainder is $a,$ then find the value of $a$.
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