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Simplifying 2x2 + 5x = 79 Reorder the terms: 5x + 2x2 = 79 Solving 5x + 2x2 = 79 Solving for variable 'x'. Reorder the terms: -79 + 5x + 2x2 = 79 + -79 Combine like terms: 79 + -79 = 0 -79 + 5x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -39.5 + 2.5x + x2 = 0 Move the constant term to the right: Add '39.5' to each side of the equation. -39.5 + 2.5x + 39.5 + x2 = 0 + 39.5 Reorder the terms: -39.5 + 39.5 + 2.5x + x2 = 0 + 39.5 Combine like terms: -39.5 + 39.5 = 0.0 0.0 + 2.5x + x2 = 0 + 39.5 2.5x + x2 = 0 + 39.5 Combine like terms: 0 + 39.5 = 39.5 2.5x + x2 = 39.5 The x term is 2.5x. Take half its coefficient (1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. 2.5x + 1.5625 + x2 = 39.5 + 1.5625 Reorder the terms: 1.5625 + 2.5x + x2 = 39.5 + 1.5625 Combine like terms: 39.5 + 1.5625 = 41.0625 1.5625 + 2.5x + x2 = 41.0625 Factor a perfect square on the left side: (x + 1.25)(x + 1.25) = 41.0625 Calculate the square root of the right side: 6.408002809 Break this problem into two subproblems by setting (x + 1.25) equal to 6.408002809 and -6.408002809.Subproblem 1
x + 1.25 = 6.408002809 Simplifying x + 1.25 = 6.408002809 Reorder the terms: 1.25 + x = 6.408002809 Solving 1.25 + x = 6.408002809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 6.408002809 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 6.408002809 + -1.25 x = 6.408002809 + -1.25 Combine like terms: 6.408002809 + -1.25 = 5.158002809 x = 5.158002809 Simplifying x = 5.158002809Subproblem 2
x + 1.25 = -6.408002809 Simplifying x + 1.25 = -6.408002809 Reorder the terms: 1.25 + x = -6.408002809 Solving 1.25 + x = -6.408002809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -6.408002809 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -6.408002809 + -1.25 x = -6.408002809 + -1.25 Combine like terms: -6.408002809 + -1.25 = -7.658002809 x = -7.658002809 Simplifying x = -7.658002809Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.158002809, -7.658002809}
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