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Q 2: If a+b+c = 0, prove that a^{3}+b^{3}+c^{3} = 3abc Answer:

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Q 5: If a+b+c 0 and a^{3}+b^{3}+c^{3} =3abc prove that a=b=c
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Q 7: Prove that (x+y)(x+z) = x(x+z)+y(x+z)= x2+xz+xy+yz= x2+x(y+z)+yz Answer:

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