Question

$a - b = 7. a.b = 18 then a3 - b3 =$
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Answer 1

· a - b = 7. a2 + b2 = (a - b)2 + 2ab 85 = 49 + 2ab. 2ab = 36. ab = 18. a3 - b3 = (a - b)3 + 3ab (a - b) = 343 + 54 7.

Answer 2

Hope this answers the question