Mathematics for IGCSE & O level - Surds (Section 2 - No. 7)

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

9

9 + 2√5

1 + 2√5

9 + √5

Explication

x + y = (5 + √5) + (4 - √5) = 9

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