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using identity, solve:- 3a 7 b-81a 4 b 4

using identity, solve:- 3a7b-81a4b4

Grade:Select Grade

1 Answers

Latika Leekha
askIITians Faculty 165 Points
8 years ago
Hello student,
The given expression is 3a7b - 81a4b4
Taking out common 3a4b we have
3a7b - 81a4b4
= 3a4b (a3 – 27b3)
= 3a4b (a – 3b)(a2 + 3ab + 9b2) (using the formula a3-b3 = (a-b)(a2+ab+b2)

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