Mathematics for IGCSE & O level - Indices 2 (Section 4 - No. 10)

If ( (rac{2}{5})^x = rac{25}{4} ), what is the value of x?

-2

-1

1

2

解释

Because ( (rac{2}{5})^x = (rac{5}{2})^{-2} ), so ( x=-2 ).

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