Question

If a + b = 10, ab=21, find a3 + b3​

Answer 1

Answer:

your answer

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Answer 2

${(a + b)}^{3} = {a}^{3} + {b}^{3} + 3ab(a + b)$

${(10)}^{3} = {a}^{3} + {b}^{3} + 3 \times 21(10)$

$1000= {a}^{3} + {b}^{3} + 630$

$1000 - 630= {a}^{3} + {b}^{3}$

$370= {a}^{3} + {b}^{3}$

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