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Simplifying -10x2 + 20x + -13 = 0 Reorder the terms: -13 + 20x + -10x2 = 0 Solving -13 + 20x + -10x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -10 the coefficient of the squared term: Divide each side by '-10'. 1.3 + -2x + x2 = 0 Move the constant term to the right: Add '-1.3' to each side of the equation. 1.3 + -2x + -1.3 + x2 = 0 + -1.3 Reorder the terms: 1.3 + -1.3 + -2x + x2 = 0 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + -2x + x2 = 0 + -1.3 -2x + x2 = 0 + -1.3 Combine like terms: 0 + -1.3 = -1.3 -2x + x2 = -1.3 The x term is -2x. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2x + 1 + x2 = -1.3 + 1 Reorder the terms: 1 + -2x + x2 = -1.3 + 1 Combine like terms: -1.3 + 1 = -0.3 1 + -2x + x2 = -0.3 Factor a perfect square on the left side: (x + -1)(x + -1) = -0.3 Can't calculate square root of the right side. The solution to this equation could not be determined.
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