Question 7

loading...

Prev/Next links

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: 

$\begin{align}  & 8{{x}^{-2}}=\frac{2}{25} \\ & {{x}^{-2}}=\frac{2}{8\times 25}=\frac{1}{100} \\ & {{x}^{2}}=100 \\ & x=\sqrt{100}=\pm 10 \\ & \text{Ignore }-10,\text{ since it is not in the options} \\\end{align}$

Jamb Maths Topic: 
Year of Exam: