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(5-x+2x
2
-x
3
)(5-x-2x
2
+x
3
)
(5-x+2x
2
-x
3
)(5-x-2x
2
+x
3
)=
(5-x+(2x
2
-x
3
))(5-x-(2x
2
-x
3
))=
((5-x)
2
-(2x
2
-x
3
)
2
) =
25-10x+x
2
-(4x
4
-4x
5
+x
6
)=
-x
6
+4x
5
-4x
4
+x
2
-10x+25
