2x^2+10x-311=0

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Solution for 2x^2+10x-311=0 equation:


Simplifying
2x2 + 10x + -311 = 0

Reorder the terms:
-311 + 10x + 2x2 = 0

Solving
-311 + 10x + 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'.
-155.5 + 5x + x2 = 0

Move the constant term to the right:

Add '155.5' to each side of the equation.
-155.5 + 5x + 155.5 + x2 = 0 + 155.5

Reorder the terms:
-155.5 + 155.5 + 5x + x2 = 0 + 155.5

Combine like terms: -155.5 + 155.5 = 0.0
0.0 + 5x + x2 = 0 + 155.5
5x + x2 = 0 + 155.5

Combine like terms: 0 + 155.5 = 155.5
5x + x2 = 155.5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 155.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 155.5 + 6.25

Combine like terms: 155.5 + 6.25 = 161.75
6.25 + 5x + x2 = 161.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 161.75

Calculate the square root of the right side: 12.718097342

Break this problem into two subproblems by setting 
(x + 2.5) equal to 12.718097342 and -12.718097342.

Subproblem 1

x + 2.5 = 12.718097342 Simplifying x + 2.5 = 12.718097342 Reorder the terms: 2.5 + x = 12.718097342 Solving 2.5 + x = 12.718097342 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 12.718097342 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 12.718097342 + -2.5 x = 12.718097342 + -2.5 Combine like terms: 12.718097342 + -2.5 = 10.218097342 x = 10.218097342 Simplifying x = 10.218097342

Subproblem 2

x + 2.5 = -12.718097342 Simplifying x + 2.5 = -12.718097342 Reorder the terms: 2.5 + x = -12.718097342 Solving 2.5 + x = -12.718097342 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -12.718097342 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -12.718097342 + -2.5 x = -12.718097342 + -2.5 Combine like terms: -12.718097342 + -2.5 = -15.218097342 x = -15.218097342 Simplifying x = -15.218097342

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.218097342, -15.218097342}

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