2x^2+5x-122=0

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Solution for 2x^2+5x-122=0 equation:


Simplifying
2x2 + 5x + -122 = 0

Reorder the terms:
-122 + 5x + 2x2 = 0

Solving
-122 + 5x + 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'.
-61 + 2.5x + x2 = 0

Move the constant term to the right:

Add '61' to each side of the equation.
-61 + 2.5x + 61 + x2 = 0 + 61

Reorder the terms:
-61 + 61 + 2.5x + x2 = 0 + 61

Combine like terms: -61 + 61 = 0
0 + 2.5x + x2 = 0 + 61
2.5x + x2 = 0 + 61

Combine like terms: 0 + 61 = 61
2.5x + x2 = 61

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 = 61 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 61 + 1.5625

Combine like terms: 61 + 1.5625 = 62.5625
1.5625 + 2.5x + x2 = 62.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 62.5625

Calculate the square root of the right side: 7.90964601

Break this problem into two subproblems by setting 
(x + 1.25) equal to 7.90964601 and -7.90964601.

Subproblem 1

x + 1.25 = 7.90964601 Simplifying x + 1.25 = 7.90964601 Reorder the terms: 1.25 + x = 7.90964601 Solving 1.25 + x = 7.90964601 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 = 7.90964601 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 7.90964601 + -1.25 x = 7.90964601 + -1.25 Combine like terms: 7.90964601 + -1.25 = 6.65964601 x = 6.65964601 Simplifying x = 6.65964601

Subproblem 2

x + 1.25 = -7.90964601 Simplifying x + 1.25 = -7.90964601 Reorder the terms: 1.25 + x = -7.90964601 Solving 1.25 + x = -7.90964601 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 = -7.90964601 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -7.90964601 + -1.25 x = -7.90964601 + -1.25 Combine like terms: -7.90964601 + -1.25 = -9.15964601 x = -9.15964601 Simplifying x = -9.15964601

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.65964601, -9.15964601}

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