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Simplifying 0 = -2x2 + 4x + 9 Reorder the terms: 0 = 9 + 4x + -2x2 Solving 0 = 9 + 4x + -2x2 Solving for variable 'x'. Combine like terms: 0 + -9 = -9 -9 + -4x + 2x2 = 9 + 4x + -2x2 + -9 + -4x + 2x2 Reorder the terms: -9 + -4x + 2x2 = 9 + -9 + 4x + -4x + -2x2 + 2x2 Combine like terms: 9 + -9 = 0 -9 + -4x + 2x2 = 0 + 4x + -4x + -2x2 + 2x2 -9 + -4x + 2x2 = 4x + -4x + -2x2 + 2x2 Combine like terms: 4x + -4x = 0 -9 + -4x + 2x2 = 0 + -2x2 + 2x2 -9 + -4x + 2x2 = -2x2 + 2x2 Combine like terms: -2x2 + 2x2 = 0 -9 + -4x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -4.5 + -2x + x2 = 0 Move the constant term to the right: Add '4.5' to each side of the equation. -4.5 + -2x + 4.5 + x2 = 0 + 4.5 Reorder the terms: -4.5 + 4.5 + -2x + x2 = 0 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + -2x + x2 = 0 + 4.5 -2x + x2 = 0 + 4.5 Combine like terms: 0 + 4.5 = 4.5 -2x + x2 = 4.5 The x term is -2x. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2x + 1 + x2 = 4.5 + 1 Reorder the terms: 1 + -2x + x2 = 4.5 + 1 Combine like terms: 4.5 + 1 = 5.5 1 + -2x + x2 = 5.5 Factor a perfect square on the left side: (x + -1)(x + -1) = 5.5 Calculate the square root of the right side: 2.34520788 Break this problem into two subproblems by setting (x + -1) equal to 2.34520788 and -2.34520788.Subproblem 1
x + -1 = 2.34520788 Simplifying x + -1 = 2.34520788 Reorder the terms: -1 + x = 2.34520788 Solving -1 + x = 2.34520788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 2.34520788 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.34520788 + 1 x = 2.34520788 + 1 Combine like terms: 2.34520788 + 1 = 3.34520788 x = 3.34520788 Simplifying x = 3.34520788Subproblem 2
x + -1 = -2.34520788 Simplifying x + -1 = -2.34520788 Reorder the terms: -1 + x = -2.34520788 Solving -1 + x = -2.34520788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -2.34520788 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.34520788 + 1 x = -2.34520788 + 1 Combine like terms: -2.34520788 + 1 = -1.34520788 x = -1.34520788 Simplifying x = -1.34520788Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.34520788, -1.34520788}
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