Q11 of 274 Page 91

If then (a3 – b3) = ?

It is given in the question that,



a2 + b2 = - ab


a2 + b2 + ab = 0 (i)


We know that,


a3 – b3 = (a – b) (a2 + b2 + ab)


From (i), we have a2 + b2 + ab = 0


∴ a3 – b3 = (a – b) × 0


a3 – b3 = 0


Hence, option D is correct

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