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Simplifying x2 + 4x = x + 9 Reorder the terms: 4x + x2 = x + 9 Reorder the terms: 4x + x2 = 9 + x Solving 4x + x2 = 9 + x Solving for variable 'x'. Reorder the terms: -9 + 4x + -1x + x2 = 9 + x + -9 + -1x Combine like terms: 4x + -1x = 3x -9 + 3x + x2 = 9 + x + -9 + -1x Reorder the terms: -9 + 3x + x2 = 9 + -9 + x + -1x Combine like terms: 9 + -9 = 0 -9 + 3x + x2 = 0 + x + -1x -9 + 3x + x2 = x + -1x Combine like terms: x + -1x = 0 -9 + 3x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '9' to each side of the equation. -9 + 3x + 9 + x2 = 0 + 9 Reorder the terms: -9 + 9 + 3x + x2 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 3x + x2 = 0 + 9 3x + x2 = 0 + 9 Combine like terms: 0 + 9 = 9 3x + x2 = 9 The x term is 3x. Take half its coefficient (1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. 3x + 2.25 + x2 = 9 + 2.25 Reorder the terms: 2.25 + 3x + x2 = 9 + 2.25 Combine like terms: 9 + 2.25 = 11.25 2.25 + 3x + x2 = 11.25 Factor a perfect square on the left side: (x + 1.5)(x + 1.5) = 11.25 Calculate the square root of the right side: 3.354101966 Break this problem into two subproblems by setting (x + 1.5) equal to 3.354101966 and -3.354101966.Subproblem 1
x + 1.5 = 3.354101966 Simplifying x + 1.5 = 3.354101966 Reorder the terms: 1.5 + x = 3.354101966 Solving 1.5 + x = 3.354101966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 3.354101966 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 3.354101966 + -1.5 x = 3.354101966 + -1.5 Combine like terms: 3.354101966 + -1.5 = 1.854101966 x = 1.854101966 Simplifying x = 1.854101966Subproblem 2
x + 1.5 = -3.354101966 Simplifying x + 1.5 = -3.354101966 Reorder the terms: 1.5 + x = -3.354101966 Solving 1.5 + x = -3.354101966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -3.354101966 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -3.354101966 + -1.5 x = -3.354101966 + -1.5 Combine like terms: -3.354101966 + -1.5 = -4.854101966 x = -4.854101966 Simplifying x = -4.854101966Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.854101966, -4.854101966}
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