if a=3+bthen find a3-b3-9ab

Given, a = 3 + b \Rightarrow a - b = 3 . . . . (1) \Rightarrow {(a - b)}^{3} = 3^{3} \Rightarrow a^{3} - b^{3} - 3 ab (a - b) = 27 \Rightarrow a^{3} - b^{3} - 3 ab (3) = 27 [from (1), a - b = 3] \Rightarrow a^{3} - b^{3} - 9 ab = 27

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