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.
Learn MoreThe square root of 130 is 11.40, rounded to two decimal places. To find the square root using the Google search engine, simply type "sqrt(130)" into the Google search box.
Full Answer >The square root of 20 is either 4.47, rounded to the nearest hundredth, or 2 times the square root of 5. The decimal answer is 4.47, and 2 times the square root of 5 is a more precise answer.
Full Answer >The square root of 121 is 11 or negative 11. The factors of 121 are 11 x 11. Similarly, negative 11 x negative 11 is also 121. To obtain an exact square root, the number must be a perfect square.
Full Answer >The square root of 225 is 15. The square root of a number is the value that can be multiplied by itself to equal the original number. Fifteen multiplied by 15 equals 225, thus making 15 the square root of 225.
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