Mathematics for IGCSE & O level - Surds (Section 2 - No. 8) | ExamPlay

Mathematics for IGCSE & O level - Surds (Section 2 - No. 8)

Simplify (√5 + 2)(√5 - 2).

1

9

-1

4√5

Explanation

(√5 + 2)(√5 - 2) = 5 - 4 = 1

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