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Simplifying 5x2 + 12x + -39991 = 0 Reorder the terms: -39991 + 12x + 5x2 = 0 Solving -39991 + 12x + 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'. -7998.2 + 2.4x + x2 = 0 Move the constant term to the right: Add '7998.2' to each side of the equation. -7998.2 + 2.4x + 7998.2 + x2 = 0 + 7998.2 Reorder the terms: -7998.2 + 7998.2 + 2.4x + x2 = 0 + 7998.2 Combine like terms: -7998.2 + 7998.2 = 0.0 0.0 + 2.4x + x2 = 0 + 7998.2 2.4x + x2 = 0 + 7998.2 Combine like terms: 0 + 7998.2 = 7998.2 2.4x + x2 = 7998.2 The x term is 2.4x. Take half its coefficient (1.2). Square it (1.44) and add it to both sides. Add '1.44' to each side of the equation. 2.4x + 1.44 + x2 = 7998.2 + 1.44 Reorder the terms: 1.44 + 2.4x + x2 = 7998.2 + 1.44 Combine like terms: 7998.2 + 1.44 = 7999.64 1.44 + 2.4x + x2 = 7999.64 Factor a perfect square on the left side: (x + 1.2)(x + 1.2) = 7999.64 Calculate the square root of the right side: 89.440706616 Break this problem into two subproblems by setting (x + 1.2) equal to 89.440706616 and -89.440706616.Subproblem 1
x + 1.2 = 89.440706616 Simplifying x + 1.2 = 89.440706616 Reorder the terms: 1.2 + x = 89.440706616 Solving 1.2 + x = 89.440706616 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = 89.440706616 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 89.440706616 + -1.2 x = 89.440706616 + -1.2 Combine like terms: 89.440706616 + -1.2 = 88.240706616 x = 88.240706616 Simplifying x = 88.240706616Subproblem 2
x + 1.2 = -89.440706616 Simplifying x + 1.2 = -89.440706616 Reorder the terms: 1.2 + x = -89.440706616 Solving 1.2 + x = -89.440706616 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = -89.440706616 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -89.440706616 + -1.2 x = -89.440706616 + -1.2 Combine like terms: -89.440706616 + -1.2 = -90.640706616 x = -90.640706616 Simplifying x = -90.640706616Solution
The solution to the problem is based on the solutions from the subproblems. x = {88.240706616, -90.640706616}
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