Question

Please help! Trouble with Precalc/Trig problem :/ Click attached

Answer 1

if they are perpendicular that means \(\theta = 90^o\)
so \[\tan^{-1} \left( \frac{\sqrt{(-x)^2 + (2)^2}}{\sqrt{(3)^2 + (12)^2}}\right ) = 90\]
or something like that

i would suggest just doing trial and error with your choices rather than really solving that...

Answer 2

but if you want you can solve that too..

Answer 3

:/ O.k.

Answer 4

hint: the dot product of two vectors will be zero if they're perpendicular to each other.