A root of an equation is a number that, when substituted into the equation, makes the value of the equation zero. Root of equations are used to find where the equation crosses the x-axis. Example: 2 is a root of x^{2} – x – 2 since 2^{2} – 2 – 2 = 4 – 2 – 2 = 0. For more information see Roots of a Polynomial.
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