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

Quartic is 4th degree

the factors of an equation with roots r1, r2 is

(x-r1) (x-r2)

4th degree

it could be

(x-r1) ¹ (x-r2) ³ or

(x-r1) ² (x-r2) ² or

(x-r1) ³ (x-r2) ¹

roots or zeroes at x=-1 and x=-2

(x - (-1)) and (x - (-2))

(x+1) and (x+2)

the function could be factored into

(x+1) ¹ (x+2) ³ or

(x+1) ² (x+2) ² or

(x+1) ³ (x+2) ¹

expanded would be

x⁴+7x³+18x²+20x+9 or

x⁴+6x³+13x²+12x+4 or

x⁴+5x³+9x²+7x+2

one of those is the answer