Multiple Choice Question (MCQ)
If a^{\frac{1}{2} }= x , where a > 0 and x > 0 , which of the following equations gives a in terms of x ?

×
a = \dfrac{1}{\sqrt{x} }

✓
a=\dfrac{1}{x^2}

×
a=\sqrt{x}

×
a=x^2