The required expression is x - sqrt(2).
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The square root of 81 is 9 as in 9 x 9 = 81
Square roots can be positive or negative. 9 x 9 = 81 -9 x -9 = 81 9 is the positive square root of 81.
56 = 2 x 2 x 2 x 7 or 23 x 71
The square root of a number is that value which when multiplied by itself gives the original number.For examplethe square root of 9 is 3 since 3 x 3 = 9;the square root of 144 is 12 since 12 x 12 = 144.
15 / 3 x 2 = 10