Question

find the length of (w1,w1) where w1=(3,2,1)​

Answer 1

Multiply the first equation by 1. 3 and the second by −1: ... detM(λ) = (2 − λ)2 − 1=(λ − 1)(λ − 3) =⇒ λ = 1,3. ... distance from x to the plane spanned by w1 and w2.