Points A = [ 2 , 1 ] , B = [ 5 , 7 ] , C = [ 0 , 4 ] {\displaystyle A=[2,1],B=[5,7],C=[0,4]} and D {\displaystyle D} form the vertices of a parallelogram A B C D {\displaystyle ABCD} that is the subject of questions A4 and A5. Note: B {\displaystyle B} and D {\displaystyle D} are points adjacent to A {\displaystyle A} .
What is the point D {\displaystyle D} ?
![{\displaystyle A=[2,1],B=[5,7],C=[0,4]}](https://wiki.ubc.ca/api/rest_v1/media/math/render/svg/9948553e2236b6a7f74b6b69ef33aa2ed9f847b3)
