Question

Which of the following is a polynomial with roots -2, -2, and 2 ?

x3 - 4x2 + 4x - 16
x3 + 4x2 + 4x + 16
x3 + 2x2 + 4x + 8
x3 - 2x2 + 4x - 8

Answer 1

x^2(x+2)+4(x+2)=(x^2 +4)(x+2)

x^2 +4=0
x_1,_2=+/- 2
x+2=0
x=-2

so than will be 3rd equation right

Answer 2

yes thank you