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Simplifying x2 + -0.8x + 0.84 = 0 Reorder the terms: 0.84 + -0.8x + x2 = 0 Solving 0.84 + -0.8x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-0.84' to each side of the equation. 0.84 + -0.8x + -0.84 + x2 = 0 + -0.84 Reorder the terms: 0.84 + -0.84 + -0.8x + x2 = 0 + -0.84 Combine like terms: 0.84 + -0.84 = 0.00 0.00 + -0.8x + x2 = 0 + -0.84 -0.8x + x2 = 0 + -0.84 Combine like terms: 0 + -0.84 = -0.84 -0.8x + x2 = -0.84 The x term is -0.8x. Take half its coefficient (-0.4). Square it (0.16) and add it to both sides. Add '0.16' to each side of the equation. -0.8x + 0.16 + x2 = -0.84 + 0.16 Reorder the terms: 0.16 + -0.8x + x2 = -0.84 + 0.16 Combine like terms: -0.84 + 0.16 = -0.68 0.16 + -0.8x + x2 = -0.68 Factor a perfect square on the left side: (x + -0.4)(x + -0.4) = -0.68 Can't calculate square root of the right side. The solution to this equation could not be determined.
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