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Simplifying -5x2 + 18x + 2 = 0 Reorder the terms: 2 + 18x + -5x2 = 0 Solving 2 + 18x + -5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -5 the coefficient of the squared term: Divide each side by '-5'. -0.4 + -3.6x + x2 = 0 Move the constant term to the right: Add '0.4' to each side of the equation. -0.4 + -3.6x + 0.4 + x2 = 0 + 0.4 Reorder the terms: -0.4 + 0.4 + -3.6x + x2 = 0 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + -3.6x + x2 = 0 + 0.4 -3.6x + x2 = 0 + 0.4 Combine like terms: 0 + 0.4 = 0.4 -3.6x + x2 = 0.4 The x term is -3.6x. Take half its coefficient (-1.8). Square it (3.24) and add it to both sides. Add '3.24' to each side of the equation. -3.6x + 3.24 + x2 = 0.4 + 3.24 Reorder the terms: 3.24 + -3.6x + x2 = 0.4 + 3.24 Combine like terms: 0.4 + 3.24 = 3.64 3.24 + -3.6x + x2 = 3.64 Factor a perfect square on the left side: (x + -1.8)(x + -1.8) = 3.64 Calculate the square root of the right side: 1.907878403 Break this problem into two subproblems by setting (x + -1.8) equal to 1.907878403 and -1.907878403.Subproblem 1
x + -1.8 = 1.907878403 Simplifying x + -1.8 = 1.907878403 Reorder the terms: -1.8 + x = 1.907878403 Solving -1.8 + x = 1.907878403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = 1.907878403 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = 1.907878403 + 1.8 x = 1.907878403 + 1.8 Combine like terms: 1.907878403 + 1.8 = 3.707878403 x = 3.707878403 Simplifying x = 3.707878403Subproblem 2
x + -1.8 = -1.907878403 Simplifying x + -1.8 = -1.907878403 Reorder the terms: -1.8 + x = -1.907878403 Solving -1.8 + x = -1.907878403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = -1.907878403 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = -1.907878403 + 1.8 x = -1.907878403 + 1.8 Combine like terms: -1.907878403 + 1.8 = -0.107878403 x = -0.107878403 Simplifying x = -0.107878403Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.707878403, -0.107878403}
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