2x(2x-1)=11

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Solution for 2x(2x-1)=11 equation:


Simplifying
2x(2x + -1) = 11

Reorder the terms:
2x(-1 + 2x) = 11
(-1 * 2x + 2x * 2x) = 11
(-2x + 4x2) = 11

Solving
-2x + 4x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + -2x + 4x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + -2x + 4x2 = 0

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

Divide each side by '4'.
-2.75 + -0.5x + x2 = 0

Move the constant term to the right:

Add '2.75' to each side of the equation.
-2.75 + -0.5x + 2.75 + x2 = 0 + 2.75

Reorder the terms:
-2.75 + 2.75 + -0.5x + x2 = 0 + 2.75

Combine like terms: -2.75 + 2.75 = 0.00
0.00 + -0.5x + x2 = 0 + 2.75
-0.5x + x2 = 0 + 2.75

Combine like terms: 0 + 2.75 = 2.75
-0.5x + x2 = 2.75

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 = 2.75 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 2.75 + 0.0625

Combine like terms: 2.75 + 0.0625 = 2.8125
0.0625 + -0.5x + x2 = 2.8125

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 2.8125

Calculate the square root of the right side: 1.677050983

Break this problem into two subproblems by setting 
(x + -0.25) equal to 1.677050983 and -1.677050983.

Subproblem 1

x + -0.25 = 1.677050983 Simplifying x + -0.25 = 1.677050983 Reorder the terms: -0.25 + x = 1.677050983 Solving -0.25 + x = 1.677050983 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 = 1.677050983 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 1.677050983 + 0.25 x = 1.677050983 + 0.25 Combine like terms: 1.677050983 + 0.25 = 1.927050983 x = 1.927050983 Simplifying x = 1.927050983

Subproblem 2

x + -0.25 = -1.677050983 Simplifying x + -0.25 = -1.677050983 Reorder the terms: -0.25 + x = -1.677050983 Solving -0.25 + x = -1.677050983 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 = -1.677050983 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -1.677050983 + 0.25 x = -1.677050983 + 0.25 Combine like terms: -1.677050983 + 0.25 = -1.427050983 x = -1.427050983 Simplifying x = -1.427050983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.927050983, -1.427050983}

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