Mathematics for IGCSE & O level - Surds (Section 1 - No. 9) | ExamPlay

Mathematics for IGCSE & O level - Surds (Section 1 - No. 9)

What is the value of (√5 + 1)(√5 - 1)?

4

6

4√5

5

Explanation

(√5 + 1)(√5 - 1) = 5 - 1 = 4

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