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Simplifying 2x2 + -9x = 20 Reorder the terms: -9x + 2x2 = 20 Solving -9x + 2x2 = 20 Solving for variable 'x'. Reorder the terms: -20 + -9x + 2x2 = 20 + -20 Combine like terms: 20 + -20 = 0 -20 + -9x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -10 + -4.5x + x2 = 0 Move the constant term to the right: Add '10' to each side of the equation. -10 + -4.5x + 10 + x2 = 0 + 10 Reorder the terms: -10 + 10 + -4.5x + x2 = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -4.5x + x2 = 0 + 10 -4.5x + x2 = 0 + 10 Combine like terms: 0 + 10 = 10 -4.5x + x2 = 10 The x term is -4.5x. Take half its coefficient (-2.25). Square it (5.0625) and add it to both sides. Add '5.0625' to each side of the equation. -4.5x + 5.0625 + x2 = 10 + 5.0625 Reorder the terms: 5.0625 + -4.5x + x2 = 10 + 5.0625 Combine like terms: 10 + 5.0625 = 15.0625 5.0625 + -4.5x + x2 = 15.0625 Factor a perfect square on the left side: (x + -2.25)(x + -2.25) = 15.0625 Calculate the square root of the right side: 3.881043674 Break this problem into two subproblems by setting (x + -2.25) equal to 3.881043674 and -3.881043674.Subproblem 1
x + -2.25 = 3.881043674 Simplifying x + -2.25 = 3.881043674 Reorder the terms: -2.25 + x = 3.881043674 Solving -2.25 + x = 3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 3.881043674 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 3.881043674 + 2.25 x = 3.881043674 + 2.25 Combine like terms: 3.881043674 + 2.25 = 6.131043674 x = 6.131043674 Simplifying x = 6.131043674Subproblem 2
x + -2.25 = -3.881043674 Simplifying x + -2.25 = -3.881043674 Reorder the terms: -2.25 + x = -3.881043674 Solving -2.25 + x = -3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -3.881043674 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -3.881043674 + 2.25 x = -3.881043674 + 2.25 Combine like terms: -3.881043674 + 2.25 = -1.631043674 x = -1.631043674 Simplifying x = -1.631043674Solution
The solution to the problem is based on the solutions from the subproblems. x = {6.131043674, -1.631043674}
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