4(a-b) - 5(a-b)^2
= 4(a-b) - 5(a^2 - 2ab + b^2)= 4a - 4b - 5a^2 + 10ab - 5b^2= -5a^2 + 10ab + 4a - 5b^2 - 4b
In square
13(x+4)^3 - 26(x+4)
= 13(x^3 + 12x^2 + 48x + 64) - 26x - 104= 13x^3 + 156x^2 + 624x + 832 - 26x - 104= 13x^3 + 156x^2 + 598x + 728
4(a-b) - 5(a-b)^2
= 4(a-b) - 5(a^2 - 2ab + b^2)
= 4a - 4b - 5a^2 + 10ab - 5b^2
= -5a^2 + 10ab + 4a - 5b^2 - 4b
In square
13(x+4)^3 - 26(x+4)
= 13(x^3 + 12x^2 + 48x + 64) - 26x - 104
= 13x^3 + 156x^2 + 624x + 832 - 26x - 104
= 13x^3 + 156x^2 + 598x + 728