_______(x^2+x)(6-x)^2_______

(x^2 + x)(6 - x)^2 = x(x - 1)(6  -x)^2 = x ( x + 1) (36 - 12x + x^2) = x(36x - 12x^2 + x^3 + 36 - 12x + x^2) = 36x^2 - 12x^3 + x^4 + 36x - 12x^2 + x^3 = 24x^2 - 11x^3 + x^4 + 36x

(x^2+x)(6-x)^2=x(x+1)(6-x)^2