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Simplifying 0.81x2 + -9x + 25 = 0 Reorder the terms: 25 + -9x + 0.81x2 = 0 Solving 25 + -9x + 0.81x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 0.81 the coefficient of the squared term: Divide each side by '0.81'. 30.86419753 + -11.11111111x + x2 = 0 Move the constant term to the right: Add '-30.86419753' to each side of the equation. 30.86419753 + -11.11111111x + -30.86419753 + x2 = 0 + -30.86419753 Reorder the terms: 30.86419753 + -30.86419753 + -11.11111111x + x2 = 0 + -30.86419753 Combine like terms: 30.86419753 + -30.86419753 = 0.00000000 0.00000000 + -11.11111111x + x2 = 0 + -30.86419753 -11.11111111x + x2 = 0 + -30.86419753 Combine like terms: 0 + -30.86419753 = -30.86419753 -11.11111111x + x2 = -30.86419753 The x term is -11.11111111x. Take half its coefficient (-5.555555555). Square it (30.86419752) and add it to both sides. Add '30.86419752' to each side of the equation. -11.11111111x + 30.86419752 + x2 = -30.86419753 + 30.86419752 Reorder the terms: 30.86419752 + -11.11111111x + x2 = -30.86419753 + 30.86419752 Combine like terms: -30.86419753 + 30.86419752 = -0.00000001 30.86419752 + -11.11111111x + x2 = -0.00000001 Factor a perfect square on the left side: (x + -5.555555555)(x + -5.555555555) = -0.00000001 Can't calculate square root of the right side. The solution to this equation could not be determined.
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