Question

Find a • b. u = <8,7>, v=<9,7>

Answer 1

`\large\boxed{\vec{u}\circ\vec{v}=121}`

Explanation:

`\vec{a}=<x_a,\ y_a>,\ \vec{b}=<x_b,\ y_b>\\\\\vec{a}\circ\vec{b}=x_ax_b+y_ay_b\\\\====================================\\\\\vec{u}=<8,\ 7>,\ \vec{v}=<9,\ 7>\\\\\vec{u}\circ\vec{v}=(8)(9)+(7)(7)=72+49=121`