Mathematics for IGCSE & O level - Indices 2 (Section 1 - No. 48)

What is the value of x when x^-2 = 4?

0.5

-0.5

2

-2

Explicaţie

x^-2=1/x² = 4, therefore x²=1/4 and x=-0.5 or +0.5

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