Q:

# What is the square root of 64?

A:

The number 64 has two square roots: -8 and 8. This is because 8 squared, or 8 times 8, is 64, and -8 squared, or -8 times -8, is also 64. Its principal square root is 8.

Every positive number has two square roots, one positive and one negative. However, each positive number has only one principal square root. When people use the phrase "the square root," they often mean "the principal square root." The principal square root is non-negative. Sixty-four is also a square number. This means that it is an integer that is a square of an integer, in this case, 8.

## Similar Questions

• A:

The square root of 720 is 26.83. The square root is determined by finding a number that, when multiplied by itself, equals the number in the square root function. For 720, this calculation is expressed as 26.83 x 26.83 = 720.

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• A:

The principal (positive) square root of 54 is 7.35 to two decimal places. There is also a negative square root, which is -7.35 to two decimal places.

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• A:

The square root of 51 is approximately 7.1414284285. There is no precise answer because the square root of 51 is an irrational number, meaning the sequence of numbers after the decimal point never ends and never falls into a repeating pattern.