8x^2-4x+4=11

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Solution for 8x^2-4x+4=11 equation:


Simplifying
8x2 + -4x + 4 = 11

Reorder the terms:
4 + -4x + 8x2 = 11

Solving
4 + -4x + 8x2 = 11

Solving for variable 'x'.

Reorder the terms:
4 + -11 + -4x + 8x2 = 11 + -11

Combine like terms: 4 + -11 = -7
-7 + -4x + 8x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-7 + -4x + 8x2 = 0

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

Divide each side by '8'.
-0.875 + -0.5x + x2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + -0.5x + 0.875 + x2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + -0.5x + x2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + -0.5x + x2 = 0 + 0.875
-0.5x + x2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
-0.5x + x2 = 0.875

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 0.875 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 0.875 + 0.0625

Combine like terms: 0.875 + 0.0625 = 0.9375
0.0625 + -0.5x + x2 = 0.9375

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 0.9375

Calculate the square root of the right side: 0.968245837

Break this problem into two subproblems by setting 
(x + -0.25) equal to 0.968245837 and -0.968245837.

Subproblem 1

x + -0.25 = 0.968245837 Simplifying x + -0.25 = 0.968245837 Reorder the terms: -0.25 + x = 0.968245837 Solving -0.25 + x = 0.968245837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 0.968245837 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 0.968245837 + 0.25 x = 0.968245837 + 0.25 Combine like terms: 0.968245837 + 0.25 = 1.218245837 x = 1.218245837 Simplifying x = 1.218245837

Subproblem 2

x + -0.25 = -0.968245837 Simplifying x + -0.25 = -0.968245837 Reorder the terms: -0.25 + x = -0.968245837 Solving -0.25 + x = -0.968245837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -0.968245837 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -0.968245837 + 0.25 x = -0.968245837 + 0.25 Combine like terms: -0.968245837 + 0.25 = -0.718245837 x = -0.718245837 Simplifying x = -0.718245837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.218245837, -0.718245837}

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