2
4
6
−2
−4
−6
5
10
15
20
25
−5
−10
0,0
–
o
+
←
↓
↑
→
f
(
x
)
=
a
x
3
+
b
x
2
+
c
x
+
d
+
e
x
−
1
+
f
x
−
2
+
g
x
−
3
a = 0.0
b = 0.0
c = 0.0
d = 0.0
e = 0.0
f = 0.0
g = 0.0
f
(
x
)
=
0
tangent
gradient = 0.0000
2
4
6
−2
−4
−6
5
10
−5
−10
−15
0,0
f
′
(
x
)
=
0