Question

What polynomial has roots of -5, -4, and 1?



A. x3 - 8x2 - 11x + 20
B. x3 - x2 + 22x + 40
C. x3 + x2 - 22x - 40
D. x3 + 8x2 + 11x - 20

Answer 1

You need to multiply out those roots to get an equation.

Answer 2

-5, -4, and 1

(x+5)(x+4)(x-1)

Answer 3

"Foil" that.

Answer 4

you make a equation out of the roots?

Answer 5

Yep. You know how when you factor a trinomial for example you get roots? If you multiply them out again, you get the same equation you started with.

Answer 6

Do you know how to do that?

Answer 7

Not really

Answer 8

(x+5)(x+4)(x-1)