39
3
?
2
s
3
=
-
27b ±
(27b)
2
-
4.(27).(-a
3
)
2.(27)
s
3
=
-
27b ±
729b
2
+
108a
3
54
?
-
b
?
729b
2
+
108a
3
s
3
=
?
?
±
?
2
?
54
?
?
2
3
Misal:
r
=
?
-
b
?
±
729b
+
108a
?
2
?
54
s
3
=
r
s
3
-
r
=
0
(s)
3
-
(³
r
)³ = 0
(s - ³
r
)(s
2
+
s(³
r
)
+
(³
r
)
2
)
=
0
s
-
3
r
=
0
atau
s
2
+
s(³
r
)
+
(³
r
)
2
=
0
s
-
3
r
=
0
s1 =
r
s
2
+
s(³
r
)
+
(³
r
)
2
=
0
s
2,3
=
-
(³
r
)
±
(³
r
)
2
-
4.(1).((³
r
)
2
)
2.(1)
s
2,3
=
-
(³
r
)
±
(³
r
)
2
-
4.(³
r
)
2
2
s2
,3
=
-
(³
r
)
±
(³
r
)
2
1
-
4
?
-
1
±
=
?
-
3
?
?
(³
)
s
2,3
?
r
?
?
 |