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Mathematics for IGCSE & O level - Surds (Section 1 - No. 7)

If x = 5 + √5 and y = 4 - √5, what is x - y?
1
1 + 2√5
9
1 + √5

Explanation

x - y = (5 + √5) - (4 - √5) = 1 + 2√5

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