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Find the roots of the equation using the Quadratic Formula
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$x\cdot x+5x-8=0$
Learn how to solve equations problems step by step online. Find the roots of xx+5x+-8=0. Find the roots of the equation using the Quadratic Formula. When multiplying two powers that have the same base (x), you can add the exponents. 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=5 and c=-8. 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.