What quadratic has roots of x=8 and x = - 5

The quadratic is f (x) = x² - 3x - 40

Step-by-step explanation:

If the roots are x=8 and x = - 5, the factors are (x - 8) and (x + 5).

The quadratic is then:

f (x) = x² + 5x - 8x - 40, or x² - 3x - 40

The quadratic is f (x) = x² - 3x - 40