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Simplifying 5x2 + -15x + -1.4 = 0 Reorder the terms: -1.4 + -15x + 5x2 = 0 Solving -1.4 + -15x + 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'. -0.28 + -3x + x2 = 0 Move the constant term to the right: Add '0.28' to each side of the equation. -0.28 + -3x + 0.28 + x2 = 0 + 0.28 Reorder the terms: -0.28 + 0.28 + -3x + x2 = 0 + 0.28 Combine like terms: -0.28 + 0.28 = 0.00 0.00 + -3x + x2 = 0 + 0.28 -3x + x2 = 0 + 0.28 Combine like terms: 0 + 0.28 = 0.28 -3x + x2 = 0.28 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 = 0.28 + 2.25 Reorder the terms: 2.25 + -3x + x2 = 0.28 + 2.25 Combine like terms: 0.28 + 2.25 = 2.53 2.25 + -3x + x2 = 2.53 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = 2.53 Calculate the square root of the right side: 1.590597372 Break this problem into two subproblems by setting (x + -1.5) equal to 1.590597372 and -1.590597372.Subproblem 1
x + -1.5 = 1.590597372 Simplifying x + -1.5 = 1.590597372 Reorder the terms: -1.5 + x = 1.590597372 Solving -1.5 + x = 1.590597372 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 = 1.590597372 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 1.590597372 + 1.5 x = 1.590597372 + 1.5 Combine like terms: 1.590597372 + 1.5 = 3.090597372 x = 3.090597372 Simplifying x = 3.090597372Subproblem 2
x + -1.5 = -1.590597372 Simplifying x + -1.5 = -1.590597372 Reorder the terms: -1.5 + x = -1.590597372 Solving -1.5 + x = -1.590597372 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 = -1.590597372 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -1.590597372 + 1.5 x = -1.590597372 + 1.5 Combine like terms: -1.590597372 + 1.5 = -0.090597372 x = -0.090597372 Simplifying x = -0.090597372Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.090597372, -0.090597372}
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