$\sqrt{2}$ is a polynomial of degree

Expand the following:
$(4a - b + 2c)^2$

Evaluate $(421)^{2}$.

Write the degree of the following polynomial: $\sqrt{11} t+14$.

Factorise the following:
$9 y^{2}-66 y z+121 z^{2}$

Using the remainder theorem,find the remainder when the polynomial $p(x) = x^{3} + x^{2} - 26x + 24$ is divided by the divisor $x - 6$.