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Simplifying 5x2 + -15x + -12 = 0 Reorder the terms: -12 + -15x + 5x2 = 0 Solving -12 + -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'. -2.4 + -3x + x2 = 0 Move the constant term to the right: Add '2.4' to each side of the equation. -2.4 + -3x + 2.4 + x2 = 0 + 2.4 Reorder the terms: -2.4 + 2.4 + -3x + x2 = 0 + 2.4 Combine like terms: -2.4 + 2.4 = 0.0 0.0 + -3x + x2 = 0 + 2.4 -3x + x2 = 0 + 2.4 Combine like terms: 0 + 2.4 = 2.4 -3x + x2 = 2.4 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 = 2.4 + 2.25 Reorder the terms: 2.25 + -3x + x2 = 2.4 + 2.25 Combine like terms: 2.4 + 2.25 = 4.65 2.25 + -3x + x2 = 4.65 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = 4.65 Calculate the square root of the right side: 2.156385865 Break this problem into two subproblems by setting (x + -1.5) equal to 2.156385865 and -2.156385865.Subproblem 1
x + -1.5 = 2.156385865 Simplifying x + -1.5 = 2.156385865 Reorder the terms: -1.5 + x = 2.156385865 Solving -1.5 + x = 2.156385865 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 = 2.156385865 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 2.156385865 + 1.5 x = 2.156385865 + 1.5 Combine like terms: 2.156385865 + 1.5 = 3.656385865 x = 3.656385865 Simplifying x = 3.656385865Subproblem 2
x + -1.5 = -2.156385865 Simplifying x + -1.5 = -2.156385865 Reorder the terms: -1.5 + x = -2.156385865 Solving -1.5 + x = -2.156385865 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 = -2.156385865 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -2.156385865 + 1.5 x = -2.156385865 + 1.5 Combine like terms: -2.156385865 + 1.5 = -0.656385865 x = -0.656385865 Simplifying x = -0.656385865Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.656385865, -0.656385865}
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