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Simplifying 2x2 + 21x + -6 = 0 Reorder the terms: -6 + 21x + 2x2 = 0 Solving -6 + 21x + 2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -3 + 10.5x + x2 = 0 Move the constant term to the right: Add '3' to each side of the equation. -3 + 10.5x + 3 + x2 = 0 + 3 Reorder the terms: -3 + 3 + 10.5x + x2 = 0 + 3 Combine like terms: -3 + 3 = 0 0 + 10.5x + x2 = 0 + 3 10.5x + x2 = 0 + 3 Combine like terms: 0 + 3 = 3 10.5x + x2 = 3 The x term is 10.5x. Take half its coefficient (5.25). Square it (27.5625) and add it to both sides. Add '27.5625' to each side of the equation. 10.5x + 27.5625 + x2 = 3 + 27.5625 Reorder the terms: 27.5625 + 10.5x + x2 = 3 + 27.5625 Combine like terms: 3 + 27.5625 = 30.5625 27.5625 + 10.5x + x2 = 30.5625 Factor a perfect square on the left side: (x + 5.25)(x + 5.25) = 30.5625 Calculate the square root of the right side: 5.528336097 Break this problem into two subproblems by setting (x + 5.25) equal to 5.528336097 and -5.528336097.Subproblem 1
x + 5.25 = 5.528336097 Simplifying x + 5.25 = 5.528336097 Reorder the terms: 5.25 + x = 5.528336097 Solving 5.25 + x = 5.528336097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = 5.528336097 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = 5.528336097 + -5.25 x = 5.528336097 + -5.25 Combine like terms: 5.528336097 + -5.25 = 0.278336097 x = 0.278336097 Simplifying x = 0.278336097Subproblem 2
x + 5.25 = -5.528336097 Simplifying x + 5.25 = -5.528336097 Reorder the terms: 5.25 + x = -5.528336097 Solving 5.25 + x = -5.528336097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = -5.528336097 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = -5.528336097 + -5.25 x = -5.528336097 + -5.25 Combine like terms: -5.528336097 + -5.25 = -10.778336097 x = -10.778336097 Simplifying x = -10.778336097Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.278336097, -10.778336097}
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