Question 985976
Hi there,
Using vectors
DE = EF
e - d = f - e
Collect like terms
-d = f - 2e
Multiply both sides by -1
d = 2e - f
d = 2(-1,6) - (2,9)
d = (-2,12) - (2,9)
d = (-4,3)
This is the missing endpoint.
Hope this helps :-)