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If $a^3-b^3=2349$ and $(a-b)=9$, then $(a+b)^2-a b$ is equal to: |
280 244 261 229 |
261 |
If $a^3-b^3=2349$ $(a-b)=9$ $(a+b)^2-a b$ = (a2 + ab + b2) ( On solving) (a3 – b3) = (a – b) (a2 + ab + b2) = 2349 = 9 (a2 + ab + b2) = (a2 + ab + b2) = 261 |
