Question

Help!! attached photo

Answer 1

check the picture below.

multiplying a vector by -1, will yield us the negative version of it, and thus a vector going in the opposite direction.

Answer 2

(4, - 7 ) or 4 - 7i

pointA( - 4, 7 ) or - 4 + 7i, hence

- 1 (- 4 + 7i ) = 4 - 7i → (4, - 7 )