What is the value of the triangle ?

Im gonna fail 7th grade selective breeding 1. creates offspring which are genetically identical to the parent 2. is the process of breeding only organisms with desirable traits 3. involves the removal of the nucleus of a cell 4. combines traits from organisms of different species

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.