p(x) = 4x - 5
p(x + 1) = 4*(x + 1) - 5 = 4x + 4 - 5 = 4x - 1
p(x + 2) = 4*(x + 2) - 5 = 4x + 8 - 5 = 4x + 3
4*(5p(x+1) - 5p(x+2)) = 4*5*(p(x+1) - p(x+2)) = 20(4x - 1 - (4x + 3)) = 20(4x - 1 - 4x - 3) = 20*(-4) = -80
p(x) = 4x - 5
p(x + 1) = 4*(x + 1) - 5 = 4x + 4 - 5 = 4x - 1
p(x + 2) = 4*(x + 2) - 5 = 4x + 8 - 5 = 4x + 3
4*(5p(x+1) - 5p(x+2)) = 4*5*(p(x+1) - p(x+2)) = 20(4x - 1 - (4x + 3)) = 20(4x - 1 - 4x - 3) = 20*(-4) = -80