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Simplifying 2x2 + -21x + -9 = 0 Reorder the terms: -9 + -21x + 2x2 = 0 Solving -9 + -21x + 2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -4.5 + -10.5x + x2 = 0 Move the constant term to the right: Add '4.5' to each side of the equation. -4.5 + -10.5x + 4.5 + x2 = 0 + 4.5 Reorder the terms: -4.5 + 4.5 + -10.5x + x2 = 0 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + -10.5x + x2 = 0 + 4.5 -10.5x + x2 = 0 + 4.5 Combine like terms: 0 + 4.5 = 4.5 -10.5x + x2 = 4.5 The x term is -10.5x. Take half its coefficient (-5.25). Square it (27.5625) and add it to both sides. Add '27.5625' to each side of the equation. -10.5x + 27.5625 + x2 = 4.5 + 27.5625 Reorder the terms: 27.5625 + -10.5x + x2 = 4.5 + 27.5625 Combine like terms: 4.5 + 27.5625 = 32.0625 27.5625 + -10.5x + x2 = 32.0625 Factor a perfect square on the left side: (x + -5.25)(x + -5.25) = 32.0625 Calculate the square root of the right side: 5.662375826 Break this problem into two subproblems by setting (x + -5.25) equal to 5.662375826 and -5.662375826.Subproblem 1
x + -5.25 = 5.662375826 Simplifying x + -5.25 = 5.662375826 Reorder the terms: -5.25 + x = 5.662375826 Solving -5.25 + x = 5.662375826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.25' to each side of the equation. -5.25 + 5.25 + x = 5.662375826 + 5.25 Combine like terms: -5.25 + 5.25 = 0.00 0.00 + x = 5.662375826 + 5.25 x = 5.662375826 + 5.25 Combine like terms: 5.662375826 + 5.25 = 10.912375826 x = 10.912375826 Simplifying x = 10.912375826Subproblem 2
x + -5.25 = -5.662375826 Simplifying x + -5.25 = -5.662375826 Reorder the terms: -5.25 + x = -5.662375826 Solving -5.25 + x = -5.662375826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.25' to each side of the equation. -5.25 + 5.25 + x = -5.662375826 + 5.25 Combine like terms: -5.25 + 5.25 = 0.00 0.00 + x = -5.662375826 + 5.25 x = -5.662375826 + 5.25 Combine like terms: -5.662375826 + 5.25 = -0.412375826 x = -0.412375826 Simplifying x = -0.412375826Solution
The solution to the problem is based on the solutions from the subproblems. x = {10.912375826, -0.412375826}
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