32
If a + b = 3 and ab = -4, then what is the value of a3 + b3?
- A36
- B63
- C12
- D-15
Answer not set
Discussion 1
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CCommunity
? a3 + b3 = (a + b)3 - 3ab(a + b)
∴ a3 + b3 = (3)3 - 3(-4)(3) = 27 + 36 = 63
∴ a3 + b3 = (3)3 - 3(-4)(3) = 27 + 36 = 63