Select the quadratic that has roots x=8 and x=-5 A:x^2+3x-40 B:x^2-3x-40 C:x^2+13x+40 D:x^2-13x+40

Question

Buck

Mathematics

12 February, 02:25

Select the quadratic that has roots x=8 and x=-5 A:x^2+3x-40 B:x^2-3x-40 C:x^2+13x+40 D:x^2-13x+40

+2

Answers (1)

Know the Answer?

Donovan Hill · Answer 1

If a quadratic has roots of a and b it has factors of (x-a) (x-b). In this case we have:

(x-8) (x+5) so if we expand by multiplication we have:

x^2-3x-40