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Mathematics for IGCSE & O level - Surds (Section 2 - No. 2)

If a = √3-√2, then a^2 = ?
5-2√6
5+2√6
1
1-2√6

Explanation

a^2 = (√3-√2)^2 = 3-2√6+2 = 5-2√6

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