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If a + b = 8 and ab = 15, then a3 + b3 is

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If a + b = 8 and ab = 15, then a3 + b3 is
1). 224
2). 244
3). 152
4). 128


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Answered by on | Votes 1 |

Applying formula; (a + b)3 = a3 + b3 + 3ab (a + b)

∴ a3 + b3 = (a + b)3 – 3 ab (a + b) = (8) 3 – 3 × 15(8) = 512 – 360 = 152

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