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Simplifying -5x2 + 19x + -20 = 0 Reorder the terms: -20 + 19x + -5x2 = 0 Solving -20 + 19x + -5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -5 the coefficient of the squared term: Divide each side by '-5'. 4 + -3.8x + x2 = 0 Move the constant term to the right: Add '-4' to each side of the equation. 4 + -3.8x + -4 + x2 = 0 + -4 Reorder the terms: 4 + -4 + -3.8x + x2 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -3.8x + x2 = 0 + -4 -3.8x + x2 = 0 + -4 Combine like terms: 0 + -4 = -4 -3.8x + x2 = -4 The x term is -3.8x. Take half its coefficient (-1.9). Square it (3.61) and add it to both sides. Add '3.61' to each side of the equation. -3.8x + 3.61 + x2 = -4 + 3.61 Reorder the terms: 3.61 + -3.8x + x2 = -4 + 3.61 Combine like terms: -4 + 3.61 = -0.39 3.61 + -3.8x + x2 = -0.39 Factor a perfect square on the left side: (x + -1.9)(x + -1.9) = -0.39 Can't calculate square root of the right side. The solution to this equation could not be determined.
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