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Question

a=3+b , then a​​​​​​3 - b​​​​​​3​​​​​-9ab is


Solution

a^3-b^3-9ab
subs value of a
=(3+b)^3-b^3 -9(3+b)×b
=(3)^ 3 +b^3+3×3×b (3+b) =27+b^3+9b (3+b)-b^3-9b (3+b)
=27+27b+9b^2-27b-9b^2 =27

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