Question

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

Answer 1

The quadratic is f(x) = x² - 3x - 40

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