Question
If (m + n) = 9 and mn = 14, then find the value of (m²
+ n²).Solution
According to the question,
(m + n) ² = 9²
⇒ m² + n² + 2mn = 81
⇒ m² + n² + 2(14) = 81
⇒ m² + n² + 28 = 81
⇒ m² + n² = 81 – 28 = 53
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