Question

Which of the following quartic functions has x=-2 and x=-3 as its only two real zeros?
a.) x^4-5x^3+7x^2-5x+6
b.) x^4+5x^3+7x^2+5x+6
c.) x^4+5x^3+7x^2-5x-6
d.) x^4-5x^3+7x^+5x-6

Answer 1

Please, you have to substitute, your numbers, namely -2 and -3 in all polynomials which you have wrote. When, after those substitutions, you get zero, in both substitutions, you have found the right polynomial.

Answer 2

So I just substitute for x? -2 and -3?

Answer 3

Yes, in all polynomials

Answer 4

Thank you!