Jambmaths question:
Solve for x in $8{{x}^{-2}}=\frac{2}{25}$
Option A:
6
Option B:
8
Option C:
10
Option D:
4
Jamb Maths Solution:
$\begin{align} & 8{{x}^{-2}}=\frac{2}{25} \\ & {{x}^{-2}}=\frac{2}{8\times 25}=\frac{1}{100} \\ & {{x}^{2}}=100 \\ & x=\sqrt{100}=\pm 10 \\ & \text{Ignore }-10,\text{ since it is not in the options} \\\end{align}$
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