multply
2a3 - 3a2b and
-1/2ab2
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ANSWER
=(2a
3
+3a
2
b)∗(
2a
−b
2
)
=2a
3
∗
2a
−b
2
+3a
2
b∗
2a
−b
2
=−(a
2
b
2
)−
2
3
ab
3
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