## Algebra 2 (1st Edition)

$f(x)=(x+7)(x+3)$.
If the x-intercepts of a graph are $a,b$, then the function has the form of $f(x)=k(x-a)(x-b)$. The x-intercepts are -7, -3; hence, the quadratic function becomes $f(x)=k(x+7)(x+3)$. The point (-1,12) is on the graph Thus: $f(x)=(x+7)(x+3)$.