0=x^2+4x-3.5

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Solution for 0=x^2+4x-3.5 equation: 


Simplifying
0 = x2 + 4x + -3.5

Reorder the terms:
0 = -3.5 + 4x + x2

Solving
0 = -3.5 + 4x + x2

Solving for variable 'x'.

Combine like terms: 0 + 3.5 = 3.5
3.5 + -4x + -1x2 = -3.5 + 4x + x2 + 3.5 + -4x + -1x2

Reorder the terms:
3.5 + -4x + -1x2 = -3.5 + 3.5 + 4x + -4x + x2 + -1x2

Combine like terms: -3.5 + 3.5 = 0.0
3.5 + -4x + -1x2 = 0.0 + 4x + -4x + x2 + -1x2
3.5 + -4x + -1x2 = 4x + -4x + x2 + -1x2

Combine like terms: 4x + -4x = 0
3.5 + -4x + -1x2 = 0 + x2 + -1x2
3.5 + -4x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
3.5 + -4x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-3.5 + 4x + x2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + 4x + 3.5 + x2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + 4x + x2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + 4x + x2 = 0 + 3.5
4x + x2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
4x + x2 = 3.5

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 = 3.5 + 4

Reorder the terms:
4 + 4x + x2 = 3.5 + 4

Combine like terms: 3.5 + 4 = 7.5
4 + 4x + x2 = 7.5

Factor a perfect square on the left side:
(x + 2)(x + 2) = 7.5

Calculate the square root of the right side: 2.738612788

Break this problem into two subproblems by setting 
(x + 2) equal to 2.738612788 and -2.738612788.


Subproblem 1
x + 2 = 2.738612788

Simplifying
x + 2 = 2.738612788

Reorder the terms:
2 + x = 2.738612788

Solving
2 + x = 2.738612788

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 = 2.738612788 + -2

Combine like terms: 2 + -2 = 0
0 + x = 2.738612788 + -2
x = 2.738612788 + -2

Combine like terms: 2.738612788 + -2 = 0.738612788
x = 0.738612788

Simplifying
x = 0.738612788


Subproblem 2
x + 2 = -2.738612788

Simplifying
x + 2 = -2.738612788

Reorder the terms:
2 + x = -2.738612788

Solving
2 + x = -2.738612788

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 = -2.738612788 + -2

Combine like terms: 2 + -2 = 0
0 + x = -2.738612788 + -2
x = -2.738612788 + -2

Combine like terms: -2.738612788 + -2 = -4.738612788
x = -4.738612788

Simplifying
x = -4.738612788


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.738612788, -4.738612788}

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