Norm 2

If $p\left(x\right) = \sum _{k=0}^n{a}_k{x}^k$ is a polynomial, its 2-norm is defined as ${\left(p\right)}_2=\sqrt{\sum _{k= 0}^n {\left(a_k\right)}^2}$

norm_2(Polynomial)

Description

Given a polynomial, returns its 2-norm.