Factorise

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

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 $3.$

Find the zero of the polynomial in each of the following cases

$q(y)=\pi y+3.14$

Expand $:(3 x+7 y)(3 x-7 y)$

If $x^{51}+51$ is divided by $x+1,$ the remainder is