Question

Find a • b. u = <8,7>, v=<9,7>

Answer 1

Answer:

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

Step-by-step explanation:

$\vec{a}=,\ \vec{b}=\\\\\vec{a}\circ\vec{b}=x_ax_b+y_ay_b\\\\====================================\\\\\vec{u}=,\ \vec{v}=\\\\\vec{u}\circ\vec{v}=(8)(9)+(7)(7)=72+49=121$