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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
Uitleg
x
-2
=1/x
2
therefore 1/x
2
=1/9 hence x=3 or x=-3
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