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If a + b = 7 and ab = 12, find a² + b².
Answer & Solution
Correct answer: D.
1. (a+b)² = a² + 2ab + b² → 49 = a² + b² + 24.
2. a² + b² = 25.
_Source: TSICET 2024 PYQ Q.93 (Shift 1, Algebra)_
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