if a+b=-1 the value of A3+b3-3ab
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a³ + b³ - 3ab = - 1
Explanation:
Now, a³ + b³ - 3ab
= (a + b)³ - 3ab (a + b) - 3ab
= (- 1)³ - 3ab (- 1) - 3ab, since a + b = - 1
= - 1 + 3ab - 3ab
= - 1
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