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

Paliwanag

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

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