Question to big for her a tad to big?

Question

Give the usual ax^2 + bx + c form of the quadratic function which has a
= 1, and has two zeros z = -5 and z = 3

Answer 1

If the zeros are x = -5 and x = 3,
then (x+5)(x-3) = 0,
so x² + 2x - 15 = 0.

Answer 2

x2+bx+c=0
25-5b+c=0
9+3b+c=0
c=5b-25
c=-9-3b
5b-25=-9-3b
8b=16
b=2
c = -15

x^2+2x-15=0