Question
If a 2 + b 2 + c 2 =
240 and ab – bc – ca = 64, then find the value of (a + b – c) 2 .Solution
(a + b – c) 2 = a 2 + b 2 + c 2 + 2(ab – bc – ca)
= 240 + 2 × 64 = 368
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