SOLUTION: if (a, -10) is a point on the graph of y=x^2-7x what is a?

Algebra ->  Graphs -> SOLUTION: if (a, -10) is a point on the graph of y=x^2-7x what is a?       Log On


   

Question 835393: if (a, -10) is a point on the graph of y=x^2-7x what is a?
Answer by reviewermath(1029) About Me  (Show Source):
You can put this solution on YOUR website!
Q:
If (a, -10) is a point on the graph of y+=+x%5E2-7x what is a?
----------------------------------------
A:
In y=x%5E2-7x, substitute x = a and y = -10, then solve for a.
-10 = a%5E2+-+7a
a%5E2+-+7a+%2B+10+=+0
(a - 2)(a - 5) = 0
Therefore, a = 2 or 5