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Find the roots of the equation using the Quadratic Formula
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$x^2+21=x$
Learn how to solve equations problems step by step online. Find the roots of x^2+21=x. Find the roots of the equation using the Quadratic Formula. Grouping all terms to the left side of the equation. To find the roots of a polynomial of the form ax^2+bx+c we use the quadratic formula, where in this case a=1, b=-1 and c=21. Then substitute the values of the coefficients of the equation in the quadratic formula: \displaystyle x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}. Simplifying.