(√3+√5)^2
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Answer is (√3)² + (√5)² + 2 × √3 × √5
= 3 + 5 + 2√15
= 8 + 2√15
= 2(4+√15)
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(√3+√5)²
(a + b)² = a² + b² + 2ab
= (√3)² + (√5)² + 2×√3×√5
= 3 + 5 + 2 ×√15
= 8 + 2√15
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