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Simplifying x2 + 0.4x + 1.21 = 0 Reorder the terms: 1.21 + 0.4x + x2 = 0 Solving 1.21 + 0.4x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-1.21' to each side of the equation. 1.21 + 0.4x + -1.21 + x2 = 0 + -1.21 Reorder the terms: 1.21 + -1.21 + 0.4x + x2 = 0 + -1.21 Combine like terms: 1.21 + -1.21 = 0.00 0.00 + 0.4x + x2 = 0 + -1.21 0.4x + x2 = 0 + -1.21 Combine like terms: 0 + -1.21 = -1.21 0.4x + x2 = -1.21 The x term is 0.4x. Take half its coefficient (0.2). Square it (0.04) and add it to both sides. Add '0.04' to each side of the equation. 0.4x + 0.04 + x2 = -1.21 + 0.04 Reorder the terms: 0.04 + 0.4x + x2 = -1.21 + 0.04 Combine like terms: -1.21 + 0.04 = -1.17 0.04 + 0.4x + x2 = -1.17 Factor a perfect square on the left side: (x + 0.2)(x + 0.2) = -1.17 Can't calculate square root of the right side. The solution to this equation could not be determined.
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