Question

I need help in finding the remainder when you divide 5x2 + 4x -40 by x-4..

(5x2 = 5x(2)
I also need to know what is the completely factored form of 4x5 - 256x3
(4x5 = 4x(5) & 256x(3)

I also need the solutions of the equation 1.5x2 - 4.5x = -3

Thank You