x^2-4x-6.25=0

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Solution for x^2-4x-6.25=0 equation: 


Simplifying
x2 + -4x + -6.25 = 0

Reorder the terms:
-6.25 + -4x + x2 = 0

Solving
-6.25 + -4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + -4x + 6.25 + x2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + -4x + x2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + -4x + x2 = 0 + 6.25
-4x + x2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
-4x + x2 = 6.25

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 6.25 + 4

Reorder the terms:
4 + -4x + x2 = 6.25 + 4

Combine like terms: 6.25 + 4 = 10.25
4 + -4x + x2 = 10.25

Factor a perfect square on the left side:
(x + -2)(x + -2) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(x + -2) equal to 3.201562119 and -3.201562119.


Subproblem 1
x + -2 = 3.201562119

Simplifying
x + -2 = 3.201562119

Reorder the terms:
-2 + x = 3.201562119

Solving
-2 + x = 3.201562119

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + x = 3.201562119 + 2

Combine like terms: -2 + 2 = 0
0 + x = 3.201562119 + 2
x = 3.201562119 + 2

Combine like terms: 3.201562119 + 2 = 5.201562119
x = 5.201562119

Simplifying
x = 5.201562119


Subproblem 2
x + -2 = -3.201562119

Simplifying
x + -2 = -3.201562119

Reorder the terms:
-2 + x = -3.201562119

Solving
-2 + x = -3.201562119

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + x = -3.201562119 + 2

Combine like terms: -2 + 2 = 0
0 + x = -3.201562119 + 2
x = -3.201562119 + 2

Combine like terms: -3.201562119 + 2 = -1.201562119
x = -1.201562119

Simplifying
x = -1.201562119


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.201562119, -1.201562119}

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