The binomial theorem states that for any positive integer n and any real numbers a and b:
$(a + b)^n = \sum_{k=0}^n \binom{n}{k} a^{n-k} b^k$
In our case, we have a = $\sqrt{k}$, b = x, and n = -2. So, we need to find the first three terms of the expansion (k =
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