State whether each of the following statements is true or false

In polynomial $5 x^{3}-3 x^{2}+11 x-14,$ the coefficient of $x^{3}$ is $3.$

Evaluate

$(215)^{2}$

For the polynomial $p(x)=x^{2}-7 x+12$ $p(2)=\ldots \ldots . .$

Factorise

$49 x^{2}-42 x+9$

Factorise the following:

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