Find the dot product of u = <8,7> and v = <-3,-2>, then determine of u and v are orthogonal. ?

u *v = (8)(-3) + (7)(-2) = - 24 - 14 = -38


Do determine that u and v are orthogonal, if and only if u * v = 0

Since u*v = - 38, therefore they are not orthogonal.