x^2+5x-1.25=0

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Solution for x^2+5x-1.25=0 equation: 


Simplifying
x2 + 5x + -1.25 = 0

Reorder the terms:
-1.25 + 5x + x2 = 0

Solving
-1.25 + 5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 5x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 5x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 5x + x2 = 0 + 1.25
5x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
5x + x2 = 1.25

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 = 1.25 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 1.25 + 6.25

Combine like terms: 1.25 + 6.25 = 7.5
6.25 + 5x + x2 = 7.5

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 7.5

Calculate the square root of the right side: 2.738612788

Break this problem into two subproblems by setting 
(x + 2.5) equal to 2.738612788 and -2.738612788.


Subproblem 1
x + 2.5 = 2.738612788

Simplifying
x + 2.5 = 2.738612788

Reorder the terms:
2.5 + x = 2.738612788

Solving
2.5 + x = 2.738612788

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 = 2.738612788 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = 2.738612788 + -2.5
x = 2.738612788 + -2.5

Combine like terms: 2.738612788 + -2.5 = 0.238612788
x = 0.238612788

Simplifying
x = 0.238612788


Subproblem 2
x + 2.5 = -2.738612788

Simplifying
x + 2.5 = -2.738612788

Reorder the terms:
2.5 + x = -2.738612788

Solving
2.5 + x = -2.738612788

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 = -2.738612788 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = -2.738612788 + -2.5
x = -2.738612788 + -2.5

Combine like terms: -2.738612788 + -2.5 = -5.238612788
x = -5.238612788

Simplifying
x = -5.238612788


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.238612788, -5.238612788}

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