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Simplifying x * x + 3x + 1 = 20 Multiply x * x x2 + 3x + 1 = 20 Reorder the terms: 1 + 3x + x2 = 20 Solving 1 + 3x + x2 = 20 Solving for variable 'x'. Reorder the terms: 1 + -20 + 3x + x2 = 20 + -20 Combine like terms: 1 + -20 = -19 -19 + 3x + x2 = 20 + -20 Combine like terms: 20 + -20 = 0 -19 + 3x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '19' to each side of the equation. -19 + 3x + 19 + x2 = 0 + 19 Reorder the terms: -19 + 19 + 3x + x2 = 0 + 19 Combine like terms: -19 + 19 = 0 0 + 3x + x2 = 0 + 19 3x + x2 = 0 + 19 Combine like terms: 0 + 19 = 19 3x + x2 = 19 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 = 19 + 2.25 Reorder the terms: 2.25 + 3x + x2 = 19 + 2.25 Combine like terms: 19 + 2.25 = 21.25 2.25 + 3x + x2 = 21.25 Factor a perfect square on the left side: (x + 1.5)(x + 1.5) = 21.25 Calculate the square root of the right side: 4.609772229 Break this problem into two subproblems by setting (x + 1.5) equal to 4.609772229 and -4.609772229.Subproblem 1
x + 1.5 = 4.609772229 Simplifying x + 1.5 = 4.609772229 Reorder the terms: 1.5 + x = 4.609772229 Solving 1.5 + x = 4.609772229 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 = 4.609772229 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 4.609772229 + -1.5 x = 4.609772229 + -1.5 Combine like terms: 4.609772229 + -1.5 = 3.109772229 x = 3.109772229 Simplifying x = 3.109772229Subproblem 2
x + 1.5 = -4.609772229 Simplifying x + 1.5 = -4.609772229 Reorder the terms: 1.5 + x = -4.609772229 Solving 1.5 + x = -4.609772229 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 = -4.609772229 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -4.609772229 + -1.5 x = -4.609772229 + -1.5 Combine like terms: -4.609772229 + -1.5 = -6.109772229 x = -6.109772229 Simplifying x = -6.109772229Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.109772229, -6.109772229}
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