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Simplifying 7x2 + -20x + 28 = 0 Reorder the terms: 28 + -20x + 7x2 = 0 Solving 28 + -20x + 7x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 7 the coefficient of the squared term: Divide each side by '7'. 4 + -2.857142857x + x2 = 0 Move the constant term to the right: Add '-4' to each side of the equation. 4 + -2.857142857x + -4 + x2 = 0 + -4 Reorder the terms: 4 + -4 + -2.857142857x + x2 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -2.857142857x + x2 = 0 + -4 -2.857142857x + x2 = 0 + -4 Combine like terms: 0 + -4 = -4 -2.857142857x + x2 = -4 The x term is -2.857142857x. Take half its coefficient (-1.428571429). Square it (2.040816328) and add it to both sides. Add '2.040816328' to each side of the equation. -2.857142857x + 2.040816328 + x2 = -4 + 2.040816328 Reorder the terms: 2.040816328 + -2.857142857x + x2 = -4 + 2.040816328 Combine like terms: -4 + 2.040816328 = -1.959183672 2.040816328 + -2.857142857x + x2 = -1.959183672 Factor a perfect square on the left side: (x + -1.428571429)(x + -1.428571429) = -1.959183672 Can't calculate square root of the right side. The solution to this equation could not be determined.
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