Mathematics for IGCSE & O level - Surds (Section 1 - No. 25) | ExamPlay

Mathematics for IGCSE & O level - Surds (Section 1 - No. 25)

If (x + √2)(x - √2) = 7, what is the value of x^2?

5

9

7

10

Explanation

x^2 - 2 = 7 => x^2 = 9

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