Find $p(1), p(2)$ and $p(4)$ for each of the following polynomials
$p(t)=t^{2}-6 t+8$
$p(1)=3, p(2)=0, p(4)=0$
Factorise the following:
$25 x^{2}+16 y^{2}+4 z^{2}-40 x y+16 y z-20 x z$
Factorise
$16 x^{2}-16 x-21$
Expand:- $(x+3 y-5 z)^{2}$
Write the coefficient of $x^{2}$ in the following polynomials
$5-7 x-3 x^{2}$
$\pi x^{2}-\frac{22}{7} x+3.14$
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