CBSE Class 9 Answered
If a - b = 7, a2 + b2
= 85 find a3 - b3.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
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
= 343 + 378 = 721
Answered by | 04 Jun, 2014, 03:23: PM
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