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Mathematics for IGCSE & O level - Surds (Section 2 - No. 10)

Which of the following expressions results in a rational number?
√2 * √8
√5 + √7
√18 - √8
√3 + √3

Explication

√2 * √8 = √16 = 4. √18-√8 = 3√2-2√2 = √2. √3 + √3 is irrational.

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