Question
If (r + s) = 7 and rs = 15, then find the value of (r² +
s²).Solution
According to the question,
(r + s) ² = 7²
⇒ r² + s² + 2rs = 49
⇒ r² + s² + 2(15) = 49
⇒ r² + s² + 30 = 49
⇒ r² + s² = 49 – 30 = 19
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