If a- b = 3 find a^3 -B^ 3cube -9AB
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a^3 - b^3 - 9 .a.b
= (a - b )^3 + 3 .a .b - 9. a.b
= (3)^3 - 6 .a.b
=27 - 6ab
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Answer:
21ab is correct please thanks me
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