using quadratic formula 2x² + √7x - 7=0
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step by step, 3 different methods for solving Quadratic Equations {2x^2-7x-7=0} ... x =(7-√ 105)/4=-0.812; x =(7+√105)/4= 4.312 ...
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√7/2 and -√7/2 are the roots of the quadratic equation
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