Question
If (a - b - c) = 6, and (ab - bc + ca) = 117, then find
the value of (a2Â + b2Â + c2)Solution
We know that, (a - b - c)2Â = a2Â + b2Â + c2Â - 2(ab - bc + ca) Or, 36 = a2Â + b2Â + c2Â - 2 X (117) Or, a2Â + b2Â + c2Â = 36 + 234 = 270
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