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Simplifying -0.2x2 + -1.8x + -16 = 0 Reorder the terms: -16 + -1.8x + -0.2x2 = 0 Solving -16 + -1.8x + -0.2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -0.2 the coefficient of the squared term: Divide each side by '-0.2'. 80 + 9x + x2 = 0 Move the constant term to the right: Add '-80' to each side of the equation. 80 + 9x + -80 + x2 = 0 + -80 Reorder the terms: 80 + -80 + 9x + x2 = 0 + -80 Combine like terms: 80 + -80 = 0 0 + 9x + x2 = 0 + -80 9x + x2 = 0 + -80 Combine like terms: 0 + -80 = -80 9x + x2 = -80 The x term is 9x. Take half its coefficient (4.5). Square it (20.25) and add it to both sides. Add '20.25' to each side of the equation. 9x + 20.25 + x2 = -80 + 20.25 Reorder the terms: 20.25 + 9x + x2 = -80 + 20.25 Combine like terms: -80 + 20.25 = -59.75 20.25 + 9x + x2 = -59.75 Factor a perfect square on the left side: (x + 4.5)(x + 4.5) = -59.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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