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Mathematics for IGCSE & O level - Surds (Section 3 - No. 6)

If x = 5 + √5 and y = 5 - 2√5, what is x + y?
10 - √5
10 - 3√5
10
10 + 3√5

Explanation

x + y = (5 + √5) + (5 - 2√5) = 10 - √5

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