2x^2-5x-61=0

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Solution for 2x^2-5x-61=0 equation:


Simplifying
2x2 + -5x + -61 = 0

Reorder the terms:
-61 + -5x + 2x2 = 0

Solving
-61 + -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'.
-30.5 + -2.5x + x2 = 0

Move the constant term to the right:

Add '30.5' to each side of the equation.
-30.5 + -2.5x + 30.5 + x2 = 0 + 30.5

Reorder the terms:
-30.5 + 30.5 + -2.5x + x2 = 0 + 30.5

Combine like terms: -30.5 + 30.5 = 0.0
0.0 + -2.5x + x2 = 0 + 30.5
-2.5x + x2 = 0 + 30.5

Combine like terms: 0 + 30.5 = 30.5
-2.5x + x2 = 30.5

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 = 30.5 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 30.5 + 1.5625

Combine like terms: 30.5 + 1.5625 = 32.0625
1.5625 + -2.5x + x2 = 32.0625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 32.0625

Calculate the square root of the right side: 5.662375826

Break this problem into two subproblems by setting 
(x + -1.25) equal to 5.662375826 and -5.662375826.

Subproblem 1

x + -1.25 = 5.662375826 Simplifying x + -1.25 = 5.662375826 Reorder the terms: -1.25 + x = 5.662375826 Solving -1.25 + x = 5.662375826 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 = 5.662375826 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 5.662375826 + 1.25 x = 5.662375826 + 1.25 Combine like terms: 5.662375826 + 1.25 = 6.912375826 x = 6.912375826 Simplifying x = 6.912375826

Subproblem 2

x + -1.25 = -5.662375826 Simplifying x + -1.25 = -5.662375826 Reorder the terms: -1.25 + x = -5.662375826 Solving -1.25 + x = -5.662375826 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 = -5.662375826 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -5.662375826 + 1.25 x = -5.662375826 + 1.25 Combine like terms: -5.662375826 + 1.25 = -4.412375826 x = -4.412375826 Simplifying x = -4.412375826

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.912375826, -4.412375826}

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