math question..

Question

Find x so that B = 3x i - 5j is perpendicular to A = 2i + 6j. Show all steps

Answer 1

Esther:

B is perpendicular to A implies the dot product B • A = 0

B = <3x ,-5>

A = <2, 6>

So B•A = (3x)*2 +6*(-5) = 0

solve for x.

Answer 2