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
