Question

If a+b=-1, then the value of a3+b3-3ab is:
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Answer 1

Answer:

Given that, a + b = 1

Taking cube of both sides, we get

(a + b)3 = 1

⇒ a3 + b3 + 3ab(a + b) = 1

⇒ a3 + b3 + 3ab = 1

Short Trick:

Here, One equation and two variable, so a and b can have infinite value.

let suppose that b = 0

⇒ a = 1

So, a3 + b3 + 3ab

⇒ 13 + 0 + 0 = 1

Step-by-step explanation:

22-Jun-2019 · 1 answer

If a + b = 1, then the value of a3 + b3 + 3ab is equal to1). 02). 13). 24). 3 If a + b = 1, then the value of a3 + b3 + 3ab is equal to

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Given that, a + b = 1 Taking cube of both sides, we get (a + b)3 = 1 ⇒ a3 + b3 + 3ab(a + b) = 1 ⇒ a3 + b3 + 3ab = 1 Short Trick:

Answer 2

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