2x^2+25x-39=0

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Solution for 2x^2+25x-39=0 equation:


Simplifying
2x2 + 25x + -39 = 0

Reorder the terms:
-39 + 25x + 2x2 = 0

Solving
-39 + 25x + 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'.
-19.5 + 12.5x + x2 = 0

Move the constant term to the right:

Add '19.5' to each side of the equation.
-19.5 + 12.5x + 19.5 + x2 = 0 + 19.5

Reorder the terms:
-19.5 + 19.5 + 12.5x + x2 = 0 + 19.5

Combine like terms: -19.5 + 19.5 = 0.0
0.0 + 12.5x + x2 = 0 + 19.5
12.5x + x2 = 0 + 19.5

Combine like terms: 0 + 19.5 = 19.5
12.5x + x2 = 19.5

The x term is 12.5x.  Take half its coefficient (6.25).
Square it (39.0625) and add it to both sides.

Add '39.0625' to each side of the equation.
12.5x + 39.0625 + x2 = 19.5 + 39.0625

Reorder the terms:
39.0625 + 12.5x + x2 = 19.5 + 39.0625

Combine like terms: 19.5 + 39.0625 = 58.5625
39.0625 + 12.5x + x2 = 58.5625

Factor a perfect square on the left side:
(x + 6.25)(x + 6.25) = 58.5625

Calculate the square root of the right side: 7.652613933

Break this problem into two subproblems by setting 
(x + 6.25) equal to 7.652613933 and -7.652613933.

Subproblem 1

x + 6.25 = 7.652613933 Simplifying x + 6.25 = 7.652613933 Reorder the terms: 6.25 + x = 7.652613933 Solving 6.25 + x = 7.652613933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.25' to each side of the equation. 6.25 + -6.25 + x = 7.652613933 + -6.25 Combine like terms: 6.25 + -6.25 = 0.00 0.00 + x = 7.652613933 + -6.25 x = 7.652613933 + -6.25 Combine like terms: 7.652613933 + -6.25 = 1.402613933 x = 1.402613933 Simplifying x = 1.402613933

Subproblem 2

x + 6.25 = -7.652613933 Simplifying x + 6.25 = -7.652613933 Reorder the terms: 6.25 + x = -7.652613933 Solving 6.25 + x = -7.652613933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.25' to each side of the equation. 6.25 + -6.25 + x = -7.652613933 + -6.25 Combine like terms: 6.25 + -6.25 = 0.00 0.00 + x = -7.652613933 + -6.25 x = -7.652613933 + -6.25 Combine like terms: -7.652613933 + -6.25 = -13.902613933 x = -13.902613933 Simplifying x = -13.902613933

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.402613933, -13.902613933}

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