# Thread: If (a,12) is a point on the graph of y=x^2+x, what is a?

1. ## If (a,12) is a point on the graph of y=x^2+x, what is a?

If (a,12) is a point on the graph of y=x^2+x, what is a? How should i go about finding this answer?

2. ## Re: If (a,12) is a point on the graph of y=x^2+x, what is a?

Originally Posted by kmerr98277
If (a,12) is a point on the graph of y=x^2+x, what is a? How should i go about finding this answer?
Can you solve $a^2+a=12~?$

3. ## Re: If (a,12) is a point on the graph of y=x^2+x, what is a?

You have (a, 12) as a point on y = x^2 + x, so that means 12 = a^2 + a. Solving this gives

a^2 + a - 12 = 0

(a + 4)(a - 3) = 0

a + 4 = 0 or a - 3 = 0

a = -4 or a = 3.