The x-intercepts of the parabola are (-3,0) and (5,0). Find the equation of the parabola, and submit your answer in \(y = ax^2 + bx + c\) form.

Wouldn't that just be (x+3)(x-5) ?

Multiply it out: x^2 -5x +3x -15

So y = x^2 -2x -15