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What is the difference between square and square root?
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If $x^2 = 25$, the solution of this equation is called the square root of $25$. The number $25$ has two square roots, namely, $5$ and $−5$. We call $5$ the principal square root or positive square root of $25$. The symbol $\sqrt{}$  is used for the principal square root. Thus, your calculator will give the answer to $\sqrt{25}$ as $5$ and not as $−5$.
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