246−2−4−651015−5−10−15−20
Cubic f(x)=ax3+bx2+cx+d
a = 1
b = -1
c = 0
d = 0
f(x)=x3x2
tangent
gradient = 6.91178
246−2−4−6510−5−10−15
Gradient function f(x)=3x22x