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Simplifying x2 + 1.8x + -0.38 = 0 Reorder the terms: -0.38 + 1.8x + x2 = 0 Solving -0.38 + 1.8x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '0.38' to each side of the equation. -0.38 + 1.8x + 0.38 + x2 = 0 + 0.38 Reorder the terms: -0.38 + 0.38 + 1.8x + x2 = 0 + 0.38 Combine like terms: -0.38 + 0.38 = 0.00 0.00 + 1.8x + x2 = 0 + 0.38 1.8x + x2 = 0 + 0.38 Combine like terms: 0 + 0.38 = 0.38 1.8x + x2 = 0.38 The x term is 1.8x. Take half its coefficient (0.9). Square it (0.81) and add it to both sides. Add '0.81' to each side of the equation. 1.8x + 0.81 + x2 = 0.38 + 0.81 Reorder the terms: 0.81 + 1.8x + x2 = 0.38 + 0.81 Combine like terms: 0.38 + 0.81 = 1.19 0.81 + 1.8x + x2 = 1.19 Factor a perfect square on the left side: (x + 0.9)(x + 0.9) = 1.19 Calculate the square root of the right side: 1.090871211 Break this problem into two subproblems by setting (x + 0.9) equal to 1.090871211 and -1.090871211.Subproblem 1
x + 0.9 = 1.090871211 Simplifying x + 0.9 = 1.090871211 Reorder the terms: 0.9 + x = 1.090871211 Solving 0.9 + x = 1.090871211 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = 1.090871211 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = 1.090871211 + -0.9 x = 1.090871211 + -0.9 Combine like terms: 1.090871211 + -0.9 = 0.190871211 x = 0.190871211 Simplifying x = 0.190871211Subproblem 2
x + 0.9 = -1.090871211 Simplifying x + 0.9 = -1.090871211 Reorder the terms: 0.9 + x = -1.090871211 Solving 0.9 + x = -1.090871211 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = -1.090871211 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = -1.090871211 + -0.9 x = -1.090871211 + -0.9 Combine like terms: -1.090871211 + -0.9 = -1.990871211 x = -1.990871211 Simplifying x = -1.990871211Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.190871211, -1.990871211}
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