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Simplifying 2x2 + 21x + -28 = 0 Reorder the terms: -28 + 21x + 2x2 = 0 Solving -28 + 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'. -14 + 10.5x + x2 = 0 Move the constant term to the right: Add '14' to each side of the equation. -14 + 10.5x + 14 + x2 = 0 + 14 Reorder the terms: -14 + 14 + 10.5x + x2 = 0 + 14 Combine like terms: -14 + 14 = 0 0 + 10.5x + x2 = 0 + 14 10.5x + x2 = 0 + 14 Combine like terms: 0 + 14 = 14 10.5x + x2 = 14 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 = 14 + 27.5625 Reorder the terms: 27.5625 + 10.5x + x2 = 14 + 27.5625 Combine like terms: 14 + 27.5625 = 41.5625 27.5625 + 10.5x + x2 = 41.5625 Factor a perfect square on the left side: (x + 5.25)(x + 5.25) = 41.5625 Calculate the square root of the right side: 6.446898479 Break this problem into two subproblems by setting (x + 5.25) equal to 6.446898479 and -6.446898479.Subproblem 1
x + 5.25 = 6.446898479 Simplifying x + 5.25 = 6.446898479 Reorder the terms: 5.25 + x = 6.446898479 Solving 5.25 + x = 6.446898479 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 = 6.446898479 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = 6.446898479 + -5.25 x = 6.446898479 + -5.25 Combine like terms: 6.446898479 + -5.25 = 1.196898479 x = 1.196898479 Simplifying x = 1.196898479Subproblem 2
x + 5.25 = -6.446898479 Simplifying x + 5.25 = -6.446898479 Reorder the terms: 5.25 + x = -6.446898479 Solving 5.25 + x = -6.446898479 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 = -6.446898479 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = -6.446898479 + -5.25 x = -6.446898479 + -5.25 Combine like terms: -6.446898479 + -5.25 = -11.696898479 x = -11.696898479 Simplifying x = -11.696898479Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.196898479, -11.696898479}
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