(2x+1)(2x+1)=8

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Solution for (2x+1)(2x+1)=8 equation:


Simplifying
(2x + 1)(2x + 1) = 8

Reorder the terms:
(1 + 2x)(2x + 1) = 8

Reorder the terms:
(1 + 2x)(1 + 2x) = 8

Multiply (1 + 2x) * (1 + 2x)
(1(1 + 2x) + 2x * (1 + 2x)) = 8
((1 * 1 + 2x * 1) + 2x * (1 + 2x)) = 8
((1 + 2x) + 2x * (1 + 2x)) = 8
(1 + 2x + (1 * 2x + 2x * 2x)) = 8
(1 + 2x + (2x + 4x2)) = 8

Combine like terms: 2x + 2x = 4x
(1 + 4x + 4x2) = 8

Solving
1 + 4x + 4x2 = 8

Solving for variable 'x'.

Reorder the terms:
1 + -8 + 4x + 4x2 = 8 + -8

Combine like terms: 1 + -8 = -7
-7 + 4x + 4x2 = 8 + -8

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

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

Divide each side by '4'.
-1.75 + x + x2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + x + 1.75 + x2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + x + x2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + x + x2 = 0 + 1.75
x + x2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
x + x2 = 1.75

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

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 1.75 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 1.75 + 0.25

Combine like terms: 1.75 + 0.25 = 2
1.25 + x2 = 2

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.414213562 and -1.414213562.

Subproblem 1

x + 0.5 = 1.414213562 Simplifying x + 0.5 = 1.414213562 Reorder the terms: 0.5 + x = 1.414213562 Solving 0.5 + x = 1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.414213562 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.414213562 + -0.5 x = 1.414213562 + -0.5 Combine like terms: 1.414213562 + -0.5 = 0.914213562 x = 0.914213562 Simplifying x = 0.914213562

Subproblem 2

x + 0.5 = -1.414213562 Simplifying x + 0.5 = -1.414213562 Reorder the terms: 0.5 + x = -1.414213562 Solving 0.5 + x = -1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.414213562 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.414213562 + -0.5 x = -1.414213562 + -0.5 Combine like terms: -1.414213562 + -0.5 = -1.914213562 x = -1.914213562 Simplifying x = -1.914213562

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.914213562, -1.914213562}

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