On dividing $x^{3}+a x^{2}+19 x+20$ by $(x+3),$ if the remainder is $a,$ then find the value of $a$.
$a=8$
Expand
$(2 x+5 y)^{2}$
Factorise the following quadratic polynomials by splitting the middle term
$x^{2}+10 x+16$
$(2 a+3 b)(2 a-5 b)$
Factorise
$9 x^{2}-21 x y+10 y^{2}$
$(2 x-y-5)^{2}$
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