2x^2+25x-8.7=0

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Solution for 2x^2+25x-8.7=0 equation: 


Simplifying
2x2 + 25x + -8.7 = 0

Reorder the terms:
-8.7 + 25x + 2x2 = 0

Solving
-8.7 + 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'.
-4.35 + 12.5x + x2 = 0

Move the constant term to the right:

Add '4.35' to each side of the equation.
-4.35 + 12.5x + 4.35 + x2 = 0 + 4.35

Reorder the terms:
-4.35 + 4.35 + 12.5x + x2 = 0 + 4.35

Combine like terms: -4.35 + 4.35 = 0.00
0.00 + 12.5x + x2 = 0 + 4.35
12.5x + x2 = 0 + 4.35

Combine like terms: 0 + 4.35 = 4.35
12.5x + x2 = 4.35

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 = 4.35 + 39.0625

Reorder the terms:
39.0625 + 12.5x + x2 = 4.35 + 39.0625

Combine like terms: 4.35 + 39.0625 = 43.4125
39.0625 + 12.5x + x2 = 43.4125

Factor a perfect square on the left side:
(x + 6.25)(x + 6.25) = 43.4125

Calculate the square root of the right side: 6.588816282

Break this problem into two subproblems by setting 
(x + 6.25) equal to 6.588816282 and -6.588816282.


Subproblem 1
x + 6.25 = 6.588816282

Simplifying
x + 6.25 = 6.588816282

Reorder the terms:
6.25 + x = 6.588816282

Solving
6.25 + x = 6.588816282

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 = 6.588816282 + -6.25

Combine like terms: 6.25 + -6.25 = 0.00
0.00 + x = 6.588816282 + -6.25
x = 6.588816282 + -6.25

Combine like terms: 6.588816282 + -6.25 = 0.338816282
x = 0.338816282

Simplifying
x = 0.338816282


Subproblem 2
x + 6.25 = -6.588816282

Simplifying
x + 6.25 = -6.588816282

Reorder the terms:
6.25 + x = -6.588816282

Solving
6.25 + x = -6.588816282

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 = -6.588816282 + -6.25

Combine like terms: 6.25 + -6.25 = 0.00
0.00 + x = -6.588816282 + -6.25
x = -6.588816282 + -6.25

Combine like terms: -6.588816282 + -6.25 = -12.838816282
x = -12.838816282

Simplifying
x = -12.838816282


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.338816282, -12.838816282}

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