√25 equals?

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Multiple Choice

√25 equals?

Explanation:
The main idea is that the square root symbol gives the principal (nonnegative) root of a number. For 25, both 5 and -5 square to 25, but the square root notation is defined to return the nonnegative value. So sqrt(25) equals 5. The number 25 is inside the radical, not the root itself, and 0 isn’t correct because 0^2 isn’t 25. Also, while -5 is indeed a valid solution to x^2 = 25, it isn’t the value produced by the square root symbol.

The main idea is that the square root symbol gives the principal (nonnegative) root of a number. For 25, both 5 and -5 square to 25, but the square root notation is defined to return the nonnegative value. So sqrt(25) equals 5. The number 25 is inside the radical, not the root itself, and 0 isn’t correct because 0^2 isn’t 25. Also, while -5 is indeed a valid solution to x^2 = 25, it isn’t the value produced by the square root symbol.

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