x^2+4x=6.25

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Solution for x^2+4x=6.25 equation: 


Simplifying
x2 + 4x = 6.25

Reorder the terms:
4x + x2 = 6.25

Solving
4x + x2 = 6.25

Solving for variable 'x'.

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

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

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 = 0.00 + 6.25

Reorder the terms:
-6.25 + 6.25 + 4x + x2 = 0.00 + 6.25

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

Combine like terms: 0.00 + 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 = 1.201562119
x = 1.201562119

Simplifying
x = 1.201562119


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 = -5.201562119
x = -5.201562119

Simplifying
x = -5.201562119


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

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