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Simplifying x2 + -5x + 20 = 0 Reorder the terms: 20 + -5x + x2 = 0 Solving 20 + -5x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-20' to each side of the equation. 20 + -5x + -20 + x2 = 0 + -20 Reorder the terms: 20 + -20 + -5x + x2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -5x + x2 = 0 + -20 -5x + x2 = 0 + -20 Combine like terms: 0 + -20 = -20 -5x + x2 = -20 The x term is -5x. Take half its coefficient (-2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. -5x + 6.25 + x2 = -20 + 6.25 Reorder the terms: 6.25 + -5x + x2 = -20 + 6.25 Combine like terms: -20 + 6.25 = -13.75 6.25 + -5x + x2 = -13.75 Factor a perfect square on the left side: (x + -2.5)(x + -2.5) = -13.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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