Question

If a+b = -1, then the value of a3+b3 -3ab is
a) -1 b) 1 c) 26 d) -26

Answer 1

Answer:

(a+b)(a²-ab+b²)-3ab

(-1)(a²+b²-ab+3ab)

(-1)(a²+b²+2ab)

(-1)(a+b)²

(-1)(-1)²

(-1)(1)

(-1)

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