Find the following products:
$\left(x^{2}-1\right)\left(x^{4}+x^{2}+1\right)$
Factorise
$9 x^{2}+42 x+49$
Check whether $g(x)$ is a factor of $p(x)$ or not, where
$p(x)=8 x^{3}-6 x^{2}-4 x+3, \quad g(x)=\frac{x}{3}-\frac{1}{4}$
Expand
$(3 x-1)(3 x+4)$
Determine the degree of each of the following polynomials:
$-10$