Question

The graph of which quadratic equation is shown below?
http://learn.flvs.net/webdav/assessment_images/educator_algebra1_v10/09_10_10.jpg

y = x2 − 2x − 3

y = x2 + 2x − 3

y = −x2 + 2x − 3

y = −x2 − 2x − 3

Answer 1

Well, we can eliminate the last two since it is concave up

Answer 2

Now all you have to do is input the given vertex (x,y) = (-1,-4) into the first two formulas to see which one works.