Question

If v is <-3, -4> Find: v • v

9
16
25
49

Answer 1

`\vec{a}=[x;\ y];\ \vec{b}=[u;\ v]\\\\\vec{a}\ \circ\ \vec{b}=xu+yv\\\\\vec{v}=[-3;-4]\\\\\vec{v}\ \circ\ \vec{v}=(-3)(-3)+(-4)(-4)=9+16=25`

Answer: 25