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The square root of a value v is a number x such that, x multiplied by x equals v. Note that -x is also a square root.
note; radius is 1/2 the diameter 4 x 3.14 x radius2
Note that x² - 1 can be written as: x² + x - x - 1 Then, factor-by-group the expression to get: x(x + 1) - (x + 1) = (x - 1)(x + 1) Hence, x2 - 1 = (x + 1)(x - 1)