The square roots of 81 are -9 and +9.
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9
9 is the square ROOT of 81. Calculating a square root is the inverse operation of squaring a number.
Sq root of 81 = 9 because 9x9=81Sq root of 121 = 11 because 11x11=1219/11 is the answer.
8 and 9
One definition of "root" is "the basic cause, source, or origin of something." The source of a perfect square is the number that was multiplied by itself to create it: the root of the square, the square root.