I would like some assistance with the following calculus exercise

1. Given the polynomial f (x) = x +x - 18x - 40 a) Show that if x +2 is a factor of f (x) then k =3 b) Factorize completely the expression f(x) =x +kx - 18.x - 40 c) Solve the equation (x) = 0 2. Differentiate each of the following functions a) y=4x' - 5x3 +4x - 10 b) = (2x2 +x+ 5 ) (x3 - 7x+1) 3.x - 5 c) x +2x+1 2 1= d) V4x +3