Answer:
B. x² - 3x - 40
Explanation:
The factored form of quadratic function:

where x₁ and x₂ are the roots of the quadratic function and the solutions of the corresponding quadratic equation.
We have x₁ = 8 and x₂ = -5. Substitute:

use FOIL: (a + b)(c + d) = ac + ad + bc + bd
![y=a[(x)(x)+(x)(5)+(-8)(x)+(-8)(5)]](https://img.qammunity.org/2020/formulas/mathematics/middle-school/vxynujfuox06pxncm4z005312keghindcr.png)


For a = 1 we have the equation:
B. x² - 3x - 40