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Simplifying x2 + 0.9x + 0.7 = 0 Reorder the terms: 0.7 + 0.9x + x2 = 0 Solving 0.7 + 0.9x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-0.7' to each side of the equation. 0.7 + 0.9x + -0.7 + x2 = 0 + -0.7 Reorder the terms: 0.7 + -0.7 + 0.9x + x2 = 0 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + 0.9x + x2 = 0 + -0.7 0.9x + x2 = 0 + -0.7 Combine like terms: 0 + -0.7 = -0.7 0.9x + x2 = -0.7 The x term is 0.9x. Take half its coefficient (0.45). Square it (0.2025) and add it to both sides. Add '0.2025' to each side of the equation. 0.9x + 0.2025 + x2 = -0.7 + 0.2025 Reorder the terms: 0.2025 + 0.9x + x2 = -0.7 + 0.2025 Combine like terms: -0.7 + 0.2025 = -0.4975 0.2025 + 0.9x + x2 = -0.4975 Factor a perfect square on the left side: (x + 0.45)(x + 0.45) = -0.4975 Can't calculate square root of the right side. The solution to this equation could not be determined.
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