Question

find the magnitude of PQ with initial point of P (-4, -7) and terminal point Q (1, -3)

Answer 1

if P was the origin, and Q was just Q-P .... then this becomes a right triangle question

Answer 2

P (-4, -7) Q ( 1, -3)
-P (-4, -7) - P (-4, -7)
--------------------------
0 , 0 5, 4 ; how far is the point (5,4) from the origin?