Find the value of
$x^{3}+y^{3}-12 x y+64,$ when $x+y=-4$
$1$
$0$
$-1$
$4$
From the following polynomials find out which of them has $(x-1)$ as a factor
$x^{3}-7 x^{2}+14 x-8$
Verify whether $3$ and $5$ are zeros of the polynomial $x^{2}-x-6$ or not.
Factorise the following:
$4 x^{2}+20 x+25$
Evaluate
$(421)^{2}$
Write whether the statement are True or False. Justify your answer.
Zero of a polynomial is always $0.$