2x^2-55x+15=122

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Solution for 2x^2-55x+15=122 equation:


Simplifying
2x2 + -55x + 15 = 122

Reorder the terms:
15 + -55x + 2x2 = 122

Solving
15 + -55x + 2x2 = 122

Solving for variable 'x'.

Reorder the terms:
15 + -122 + -55x + 2x2 = 122 + -122

Combine like terms: 15 + -122 = -107
-107 + -55x + 2x2 = 122 + -122

Combine like terms: 122 + -122 = 0
-107 + -55x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-53.5 + -27.5x + x2 = 0

Move the constant term to the right:

Add '53.5' to each side of the equation.
-53.5 + -27.5x + 53.5 + x2 = 0 + 53.5

Reorder the terms:
-53.5 + 53.5 + -27.5x + x2 = 0 + 53.5

Combine like terms: -53.5 + 53.5 = 0.0
0.0 + -27.5x + x2 = 0 + 53.5
-27.5x + x2 = 0 + 53.5

Combine like terms: 0 + 53.5 = 53.5
-27.5x + x2 = 53.5

The x term is -27.5x.  Take half its coefficient (-13.75).
Square it (189.0625) and add it to both sides.

Add '189.0625' to each side of the equation.
-27.5x + 189.0625 + x2 = 53.5 + 189.0625

Reorder the terms:
189.0625 + -27.5x + x2 = 53.5 + 189.0625

Combine like terms: 53.5 + 189.0625 = 242.5625
189.0625 + -27.5x + x2 = 242.5625

Factor a perfect square on the left side:
(x + -13.75)(x + -13.75) = 242.5625

Calculate the square root of the right side: 15.574418127

Break this problem into two subproblems by setting 
(x + -13.75) equal to 15.574418127 and -15.574418127.

Subproblem 1

x + -13.75 = 15.574418127 Simplifying x + -13.75 = 15.574418127 Reorder the terms: -13.75 + x = 15.574418127 Solving -13.75 + x = 15.574418127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13.75' to each side of the equation. -13.75 + 13.75 + x = 15.574418127 + 13.75 Combine like terms: -13.75 + 13.75 = 0.00 0.00 + x = 15.574418127 + 13.75 x = 15.574418127 + 13.75 Combine like terms: 15.574418127 + 13.75 = 29.324418127 x = 29.324418127 Simplifying x = 29.324418127

Subproblem 2

x + -13.75 = -15.574418127 Simplifying x + -13.75 = -15.574418127 Reorder the terms: -13.75 + x = -15.574418127 Solving -13.75 + x = -15.574418127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13.75' to each side of the equation. -13.75 + 13.75 + x = -15.574418127 + 13.75 Combine like terms: -13.75 + 13.75 = 0.00 0.00 + x = -15.574418127 + 13.75 x = -15.574418127 + 13.75 Combine like terms: -15.574418127 + 13.75 = -1.824418127 x = -1.824418127 Simplifying x = -1.824418127

Solution

The solution to the problem is based on the solutions from the subproblems. x = {29.324418127, -1.824418127}

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