(2x+1)(x-1)=36

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Solution for (2x+1)(x-1)=36 equation:


Simplifying
(2x + 1)(x + -1) = 36

Reorder the terms:
(1 + 2x)(x + -1) = 36

Reorder the terms:
(1 + 2x)(-1 + x) = 36

Multiply (1 + 2x) * (-1 + x)
(1(-1 + x) + 2x * (-1 + x)) = 36
((-1 * 1 + x * 1) + 2x * (-1 + x)) = 36
((-1 + 1x) + 2x * (-1 + x)) = 36
(-1 + 1x + (-1 * 2x + x * 2x)) = 36
(-1 + 1x + (-2x + 2x2)) = 36

Combine like terms: 1x + -2x = -1x
(-1 + -1x + 2x2) = 36

Solving
-1 + -1x + 2x2 = 36

Solving for variable 'x'.

Reorder the terms:
-1 + -36 + -1x + 2x2 = 36 + -36

Combine like terms: -1 + -36 = -37
-37 + -1x + 2x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-37 + -1x + 2x2 = 0

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

Divide each side by '2'.
-18.5 + -0.5x + x2 = 0

Move the constant term to the right:

Add '18.5' to each side of the equation.
-18.5 + -0.5x + 18.5 + x2 = 0 + 18.5

Reorder the terms:
-18.5 + 18.5 + -0.5x + x2 = 0 + 18.5

Combine like terms: -18.5 + 18.5 = 0.0
0.0 + -0.5x + x2 = 0 + 18.5
-0.5x + x2 = 0 + 18.5

Combine like terms: 0 + 18.5 = 18.5
-0.5x + x2 = 18.5

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 = 18.5 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 18.5 + 0.0625

Combine like terms: 18.5 + 0.0625 = 18.5625
0.0625 + -0.5x + x2 = 18.5625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 18.5625

Calculate the square root of the right side: 4.308421985

Break this problem into two subproblems by setting 
(x + -0.25) equal to 4.308421985 and -4.308421985.

Subproblem 1

x + -0.25 = 4.308421985 Simplifying x + -0.25 = 4.308421985 Reorder the terms: -0.25 + x = 4.308421985 Solving -0.25 + x = 4.308421985 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 = 4.308421985 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 4.308421985 + 0.25 x = 4.308421985 + 0.25 Combine like terms: 4.308421985 + 0.25 = 4.558421985 x = 4.558421985 Simplifying x = 4.558421985

Subproblem 2

x + -0.25 = -4.308421985 Simplifying x + -0.25 = -4.308421985 Reorder the terms: -0.25 + x = -4.308421985 Solving -0.25 + x = -4.308421985 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 = -4.308421985 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -4.308421985 + 0.25 x = -4.308421985 + 0.25 Combine like terms: -4.308421985 + 0.25 = -4.058421985 x = -4.058421985 Simplifying x = -4.058421985

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.558421985, -4.058421985}

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