الاجابة
d(x) = -x3 + x + 1
d(4y – 3) = -(4y – 3)3 + (4y -3) + 1
(4y -3)3 = (4y – 3) (4y – 3)2
(4y-3)3 = (4y-3) (16y2 – 24y + 9)
(4y-3)3 = 64y3 -144y2 +108y -27
d(4y-3) = 64y3 + 144y2 – 108y + 27 + 4y – 3 + 1
d(4y-3) = -64y3 + 144y2 – 104y + 25