(4
) Simplify : x² ( x - 3y2 ) - xy ( y2 - 2xy) - x ( yº - 5x2)
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Given x
2
(x−3y
2
)−xy(y
2
−2xy)−x(y
3
−5x
2
)
=x
3
−3x
2
y
2
−xy
3
+2x
2
y
2
−xy
3
+5x
3
=6x
3
−2xy
3
−x
2
y
2
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