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Simplifying 2x2 + 0.4x = 3 Reorder the terms: 0.4x + 2x2 = 3 Solving 0.4x + 2x2 = 3 Solving for variable 'x'. Reorder the terms: -3 + 0.4x + 2x2 = 3 + -3 Combine like terms: 3 + -3 = 0 -3 + 0.4x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -1.5 + 0.2x + x2 = 0 Move the constant term to the right: Add '1.5' to each side of the equation. -1.5 + 0.2x + 1.5 + x2 = 0 + 1.5 Reorder the terms: -1.5 + 1.5 + 0.2x + x2 = 0 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + 0.2x + x2 = 0 + 1.5 0.2x + x2 = 0 + 1.5 Combine like terms: 0 + 1.5 = 1.5 0.2x + x2 = 1.5 The x term is 0.2x. Take half its coefficient (0.1). Square it (0.01) and add it to both sides. Add '0.01' to each side of the equation. 0.2x + 0.01 + x2 = 1.5 + 0.01 Reorder the terms: 0.01 + 0.2x + x2 = 1.5 + 0.01 Combine like terms: 1.5 + 0.01 = 1.51 0.01 + 0.2x + x2 = 1.51 Factor a perfect square on the left side: (x + 0.1)(x + 0.1) = 1.51 Calculate the square root of the right side: 1.228820573 Break this problem into two subproblems by setting (x + 0.1) equal to 1.228820573 and -1.228820573.Subproblem 1
x + 0.1 = 1.228820573 Simplifying x + 0.1 = 1.228820573 Reorder the terms: 0.1 + x = 1.228820573 Solving 0.1 + x = 1.228820573 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 1.228820573 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 1.228820573 + -0.1 x = 1.228820573 + -0.1 Combine like terms: 1.228820573 + -0.1 = 1.128820573 x = 1.128820573 Simplifying x = 1.128820573Subproblem 2
x + 0.1 = -1.228820573 Simplifying x + 0.1 = -1.228820573 Reorder the terms: 0.1 + x = -1.228820573 Solving 0.1 + x = -1.228820573 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -1.228820573 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -1.228820573 + -0.1 x = -1.228820573 + -0.1 Combine like terms: -1.228820573 + -0.1 = -1.328820573 x = -1.328820573 Simplifying x = -1.328820573Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.128820573, -1.328820573}
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