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.
Know MoreEvery 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.
Learn more about ExponentsThe square root of 39 is 6.24. The square root of any number can be determined by plugging it into the equation x times x equals y. When solving this formula to find the square root of 39, the formula is 6.24 times 6.24 equals 39.
Full Answer >The square root of 81 is 9. However, if a student needs to solve the equation Â x^{2} = 81, then possible solutions can be either +9 or -9.
Â Full Answer >The square root of 189 is equal to 3 times the square root of 21, or approximately 13.75. To simplify the square root of a number, the number must first be broken down into its factors, looking especially for perfect squares.
Full Answer >The principal square root of 160 is 12.65 to two decimal places. The other square root of 160 is minus 12.65 to two decimal places. All real numbers have two square roots, one of which is the negative of the other.
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