Question
If (r + s + t) = 12 and (rs + st + tr) = 60, then find
the value of (r² + s² + t²).Solution
ATQ,
As we know,
(r + s + t)² = r² + s² + t² + 2(rs + st + tr)
Or, (12)² = r² + s² + t² + 2 × (60)
So, r² + s² + t² = 144 – 120 = 24
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