Question

What Is The Answer? I also don't Understand this

Answer 1

We need to simplify this number.  We begin by evaluating the numbers inside the equation.  We can simplify this to:

$(2 \sqrt{k})^{-2}$

Now, we evaluate this one step further.  Because a negative exponent makes the number 1 over what it was, we can make this problem:

$\frac{1}{(2 \sqrt{k})^{2} }$

This becomes:

$\frac{1}{(2 \sqrt{k})(2 \sqrt{k} ) } --\ \textgreater \ \frac{1}{4k}$

So, 1/4k is the answer.  This is the same as C, so C is the right answer.