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Google search results:
1: https://www.geeksforgeeks.org/python-program-to-solve-quadratic-equation/
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2: https://www.montereyinstitute.org/courses/DevelopmentalMath/COURSE_TEXT2_RESOURCE/U16_L5_T2_text_final.html
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3: https://opentextbc.ca/elementaryalgebraopenstax/chapter/solve-quadratic-equations-using-the-quadratic-formula/
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4: https://www.mathsisfun.com/quadratic-equation-solver.html
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5: https://www.mathsisfun.com/algebra/quadratic-equation.html
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6: https://stackoverflow.com/questions/15398427/solving-quadratic-equation
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7: https://www.programiz.com/python-programming/examples/quadratic-roots
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8: https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadratic-functions-equations/x2f8bb11595b61c86:quadratic-formula-a1/v/quadratic-formula-3
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9: https://www.purplemath.com/modules/quadform.htm
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10: https://sharylandisd.org/common/pages/UserFile.aspx?fileId=2569921
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11: https://en.wikipedia.org/wiki/Quadratic_equation
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12: https://www.brightstorm.com/math/algebra-2/quadratic-equations-and-inequalities/overview-of-the-different-methods-of-solving-a-quadratic-equation/
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13: https://www.cliffsnotes.com/study-guides/algebra/algebra-i/quadratic-equations/solving-quadratic-equations
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14: https://www.youtube.com/watch?v=x3o2WJ5rHhU
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