Which of the following quartic functions has x=-1 and x=-2 as its only two real zeros?

x^4-3x^3+3x^2-3x+2
x^4+3x^3+3x^2-3x-2
x^4+3x^3+3x^2+3x+2
x^4-3x^3-3x^2+3x+2

x^4 - 3x^3 + 3x^2 - 3x + 2

x = 1 and x = 2

x = -0.5147 and x = 0.8516

x = -2 and x = -1

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl