# Math Help - finding a and b in quadratic function

1. ## finding a and b in quadratic function

Hello everyone, I do not how to initiate the first step for this question. However, I know it has to do with the vertex and the axis of symmetry. The attached image is the question. Pls help me out!

2. ## Re: finding a and b in quadratic function

The axis of symmetry is x = -b/(2a).

3. ## Re: finding a and b in quadratic function

Alternatively, if the axis of symmetry is x= -3/8 the quadratic is of the form $y= a(x+ 3/8)^2+ e$. The fact that "c" is equal to 7 will allow you to find one of a and e as a function of the other but you cannot determine both.

4. ## Re: finding a and b in quadratic function

Originally Posted by HallsofIvy
Alternatively, if the axis of symmetry is x= -3/8 the quadratic is of the form $y= a(x+ 3/8)^2+ e$. The fact that "c" is equal to 7 will allow you to find one of a and e as a function of the other but you cannot determine both.
The question asks for A possible function, not THE possible function.