Factorise the following quadratic polynomials by splitting the middle term

$x^{2}-12 x+20$

With the help of the remainder theorem. find the remainder when the polynomial $x^{3}+7 x^{2}+17 x+25$ is divided by $x+4$

Factorise :

$x^{2}+9 x+18$

If $p(x)=x+3,$ then $p(x)+p(-x)$ is equal to

Factorise the following:

$4 x^{2}+20 x+25$