x^2-4x-4=2.5+4

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Solution for x^2-4x-4=2.5+4 equation:


Simplifying
x2 + -4x + -4 = 2.5 + 4

Reorder the terms:
-4 + -4x + x2 = 2.5 + 4

Combine like terms: 2.5 + 4 = 6.5
-4 + -4x + x2 = 6.5

Solving
-4 + -4x + x2 = 6.5

Solving for variable 'x'.

Reorder the terms:
-4 + -6.5 + -4x + x2 = 6.5 + -6.5

Combine like terms: -4 + -6.5 = -10.5
-10.5 + -4x + x2 = 6.5 + -6.5

Combine like terms: 6.5 + -6.5 = 0.0
-10.5 + -4x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '10.5' to each side of the equation.
-10.5 + -4x + 10.5 + x2 = 0.0 + 10.5

Reorder the terms:
-10.5 + 10.5 + -4x + x2 = 0.0 + 10.5

Combine like terms: -10.5 + 10.5 = 0.0
0.0 + -4x + x2 = 0.0 + 10.5
-4x + x2 = 0.0 + 10.5

Combine like terms: 0.0 + 10.5 = 10.5
-4x + x2 = 10.5

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 = 10.5 + 4

Reorder the terms:
4 + -4x + x2 = 10.5 + 4

Combine like terms: 10.5 + 4 = 14.5
4 + -4x + x2 = 14.5

Factor a perfect square on the left side:
(x + -2)(x + -2) = 14.5

Calculate the square root of the right side: 3.807886553

Break this problem into two subproblems by setting 
(x + -2) equal to 3.807886553 and -3.807886553.

Subproblem 1

x + -2 = 3.807886553 Simplifying x + -2 = 3.807886553 Reorder the terms: -2 + x = 3.807886553 Solving -2 + x = 3.807886553 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 = 3.807886553 + 2 Combine like terms: -2 + 2 = 0 0 + x = 3.807886553 + 2 x = 3.807886553 + 2 Combine like terms: 3.807886553 + 2 = 5.807886553 x = 5.807886553 Simplifying x = 5.807886553

Subproblem 2

x + -2 = -3.807886553 Simplifying x + -2 = -3.807886553 Reorder the terms: -2 + x = -3.807886553 Solving -2 + x = -3.807886553 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 = -3.807886553 + 2 Combine like terms: -2 + 2 = 0 0 + x = -3.807886553 + 2 x = -3.807886553 + 2 Combine like terms: -3.807886553 + 2 = -1.807886553 x = -1.807886553 Simplifying x = -1.807886553

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.807886553, -1.807886553}

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