If a – b = 7, a2 + b2 = 85, find a3 – b3
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8
a3-b3
=(a-b)(a2+ab+b2)
=7(a2+b2+ab)
=7(85+ab)
=595+7ab
=(a-b)(a2+ab+b2)
=7(a2+b2+ab)
=7(85+ab)
=595+7ab
Answered by
12
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