Question

1. If a + b + c = 5 and ab + bc + ca = 10, then prove that a³ + b³ + c³ -3abc = - 25.

2. Prove that (a + b + c)³ - a³-b³-c³ = 3(a + b )(b + c) (c + a).

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Answer 1

Step-by-step explanation:

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Answer 2

Answer:

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