If $(5 x-3)^{2}=25 x^{2}+k x+9,$ then find $k$
$-45$
$20$
$15$
$-30$
Find the zero of the polynomial in each of the following cases
$p(t)=7 t-21$
Find the value of $m$ so that $2 x-1$ be a factor of $8 x^{4}+4 x^{3}-16 x^{2}+10 x+m.$
Factorise
$6 x^{3}-23 x^{2}+29 x-12$
Expand the following:
$(3 a-2 b)^{3}$
Factorise
$x^{3}-11 x^{2}+20 x+32$