Question

Which of the following quartic functions has x = -2 and x =-3 as its only two real zeroes?

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^2 + 5x - 6

Answer 1

The answer is option b because by substituting the values corresponding to x = -2 and x = -3 then the result of the equation is zero. Therefore, it is shown that for this equation both roots of the polynomial are correct.