pls answer me .......
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[(a-b)³ = a³ - b³ -3(ab)(a+b)]
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siddhijha32gmailcom:
sorry but this is wrong answer
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(A-b) ^3=a^3-3ab(a-b)-b^3
here,
in (3r-2k)^3
3r=a and 2k=b
so, 27r^3-18rk(3r-2k)-8k^3 (ans)
here,
in (3r-2k)^3
3r=a and 2k=b
so, 27r^3-18rk(3r-2k)-8k^3 (ans)
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