Question

Please solve these sums.

Answer 1

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1} (a - b)^2 = a^2 + b^2 - 2ab
=> 72 - 2ab
=> 72 - 8
=> 64
(a - b)^2 = (8)^2
(a - b) = 8Ans.

2} (a + b + c)^2 = a^2 + b^2 + c^2 + 2ab + 2bc +2ca
=> 15 + 2{10}
=> 15 + 20
=> 35Ans.

3} (a + b + c)^2 = (6)^2
=> a^2 + b^2 + c^2 + 2ab + 2bc + 2ca = 36
=> a^2 + b^2 + c^2 + 2{ 11 } = 36
=> a^2 + b^2 + c^2 = 36 - 22
=> a^2 + b^2 + c^2 = 14Ans.

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