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Simplifying 9x2 + 9x + 20 = 0 Reorder the terms: 20 + 9x + 9x2 = 0 Solving 20 + 9x + 9x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 9 the coefficient of the squared term: Divide each side by '9'. 2.222222222 + x + x2 = 0 Move the constant term to the right: Add '-2.222222222' to each side of the equation. 2.222222222 + x + -2.222222222 + x2 = 0 + -2.222222222 Reorder the terms: 2.222222222 + -2.222222222 + x + x2 = 0 + -2.222222222 Combine like terms: 2.222222222 + -2.222222222 = 0.000000000 0.000000000 + x + x2 = 0 + -2.222222222 x + x2 = 0 + -2.222222222 Combine like terms: 0 + -2.222222222 = -2.222222222 x + x2 = -2.222222222 The x term is x. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. + 0.25 + x2 = -2.222222222 + 0.25 Combine like terms: + 0.25 = 1.25 1.25 + x2 = -2.222222222 + 0.25 Combine like terms: -2.222222222 + 0.25 = -1.972222222 1.25 + x2 = -1.972222222 Factor a perfect square on the left side: (x + 0.5)(x + 0.5) = -1.972222222 Can't calculate square root of the right side. The solution to this equation could not be determined.
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