Answer:
y=x²+x-12
Step-by-step explanation:
The quadratic standard form is given by this formula: ax² +bx +c =0.
However all we have is the zeros of this function.
1) So let's start by plugging into x the zeros. We will have two linear functions

2) Solving the system of linear equations, by the Addition Method:

Therefore a=b and c=-12 and x=-4 and x=3
Since a=b, let's assume a=1 and b=1 and as c=-12 is the product of -4*3 hence we can rewrite this equation grouping it, and then test it:
Standard form