(2x^2-1)(4)-(x+1)(4)=0

Solution for (2x^2-1)(4)-(x+1)(4)=0 equation:

Simplifying
(2x2 + -1)(4) + -1(x + 1)(4) = 0

Reorder the terms:
(-1 + 2x2)(4) + -1(x + 1)(4) = 0

Reorder the terms for easier multiplication:
4(-1 + 2x2) + -1(x + 1)(4) = 0
(-1 * 4 + 2x2 * 4) + -1(x + 1)(4) = 0
(-4 + 8x2) + -1(x + 1)(4) = 0

Reorder the terms:
-4 + 8x2 + -1(1 + x)(4) = 0

Reorder the terms for easier multiplication:
-4 + 8x2 + -1 * 4(1 + x) = 0

Multiply -1 * 4
-4 + 8x2 + -4(1 + x) = 0
-4 + 8x2 + (1 * -4 + x * -4) = 0
-4 + 8x2 + (-4 + -4x) = 0

Reorder the terms:
-4 + -4 + -4x + 8x2 = 0

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

Solving
-8 + -4x + 8x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-2 + -1x + 2x2) = 0

Ignore the factor 4.
Subproblem 1
Set the factor '(-2 + -1x + 2x2)' equal to zero and attempt to solve:

Simplifying
-2 + -1x + 2x2 = 0

Solving
-2 + -1x + 2x2 = 0

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

Divide each side by '2'.
-1 + -0.5x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.5x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.5x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.5x + x2 = 0 + 1
-0.5x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.5x + x2 = 1

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 = 1 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 1 + 0.0625

Combine like terms: 1 + 0.0625 = 1.0625
0.0625 + -0.5x + x2 = 1.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(x + -0.25) equal to 1.030776406 and -1.030776406.

Subproblem 1
x + -0.25 = 1.030776406

Simplifying
x + -0.25 = 1.030776406

Reorder the terms:
-0.25 + x = 1.030776406

Solving
-0.25 + x = 1.030776406

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 = 1.030776406 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + x = 1.030776406 + 0.25
x = 1.030776406 + 0.25

Combine like terms: 1.030776406 + 0.25 = 1.280776406
x = 1.280776406

Simplifying
x = 1.280776406

Subproblem 2
x + -0.25 = -1.030776406

Simplifying
x + -0.25 = -1.030776406

Reorder the terms:
-0.25 + x = -1.030776406

Solving
-0.25 + x = -1.030776406

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 = -1.030776406 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + x = -1.030776406 + 0.25
x = -1.030776406 + 0.25

Combine like terms: -1.030776406 + 0.25 = -0.780776406
x = -0.780776406

Simplifying
x = -0.780776406

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.280776406, -0.780776406}
Solution
x = {1.280776406, -0.780776406}