$$\sqrt{625}-\sqrt{529}=\sqrt{?}$$
Let the unknown be $$x$$.
$$25^{2} = 625$$
$$23^{2} = 529$$
$$\sqrt{625}-\sqrt{529} = 25-23 = 2$$
$$\sqrt{x} = 2$$
Hence $$x=4$$
Hence Option B is the correct answer.
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