Factorise: 64a 3 -27b 3 -144a 2 b+108ab 2
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8
=(4a)^3-(3b)^3-3×(4a)^2×(3b)+3(4a)×(3b)^2
Putting the identity:-
(a-b)^3=a^3-b^3-3a^2×b+3a×b^2
=(4a-3b)^3
Putting the identity:-
(a-b)^3=a^3-b^3-3a^2×b+3a×b^2
=(4a-3b)^3
Answered by
2
4a-3b)^3 is the factorised answer
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