Mathematics for IGCSE & O level - Indices 2 (Section 2 - No. 4) | ExamPlay

Mathematics for IGCSE & O level - Indices 2 (Section 2 - No. 4)

If x^-2 = 1/9, what is the value of x?

-3

3

-1/3

1/3

Explanation

x^-2=1/x² therefore 1/x²=1/9 hence x=3 or x=-3

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