(2x-2)(4x+1)=125

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Solution for (2x-2)(4x+1)=125 equation:


Simplifying
(2x + -2)(4x + 1) = 125

Reorder the terms:
(-2 + 2x)(4x + 1) = 125

Reorder the terms:
(-2 + 2x)(1 + 4x) = 125

Multiply (-2 + 2x) * (1 + 4x)
(-2(1 + 4x) + 2x * (1 + 4x)) = 125
((1 * -2 + 4x * -2) + 2x * (1 + 4x)) = 125
((-2 + -8x) + 2x * (1 + 4x)) = 125
(-2 + -8x + (1 * 2x + 4x * 2x)) = 125
(-2 + -8x + (2x + 8x2)) = 125

Combine like terms: -8x + 2x = -6x
(-2 + -6x + 8x2) = 125

Solving
-2 + -6x + 8x2 = 125

Solving for variable 'x'.

Reorder the terms:
-2 + -125 + -6x + 8x2 = 125 + -125

Combine like terms: -2 + -125 = -127
-127 + -6x + 8x2 = 125 + -125

Combine like terms: 125 + -125 = 0
-127 + -6x + 8x2 = 0

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

Divide each side by '8'.
-15.875 + -0.75x + x2 = 0

Move the constant term to the right:

Add '15.875' to each side of the equation.
-15.875 + -0.75x + 15.875 + x2 = 0 + 15.875

Reorder the terms:
-15.875 + 15.875 + -0.75x + x2 = 0 + 15.875

Combine like terms: -15.875 + 15.875 = 0.000
0.000 + -0.75x + x2 = 0 + 15.875
-0.75x + x2 = 0 + 15.875

Combine like terms: 0 + 15.875 = 15.875
-0.75x + x2 = 15.875

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 15.875 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 15.875 + 0.140625

Combine like terms: 15.875 + 0.140625 = 16.015625
0.140625 + -0.75x + x2 = 16.015625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 16.015625

Calculate the square root of the right side: 4.001952648

Break this problem into two subproblems by setting 
(x + -0.375) equal to 4.001952648 and -4.001952648.

Subproblem 1

x + -0.375 = 4.001952648 Simplifying x + -0.375 = 4.001952648 Reorder the terms: -0.375 + x = 4.001952648 Solving -0.375 + x = 4.001952648 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 4.001952648 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 4.001952648 + 0.375 x = 4.001952648 + 0.375 Combine like terms: 4.001952648 + 0.375 = 4.376952648 x = 4.376952648 Simplifying x = 4.376952648

Subproblem 2

x + -0.375 = -4.001952648 Simplifying x + -0.375 = -4.001952648 Reorder the terms: -0.375 + x = -4.001952648 Solving -0.375 + x = -4.001952648 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -4.001952648 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -4.001952648 + 0.375 x = -4.001952648 + 0.375 Combine like terms: -4.001952648 + 0.375 = -3.626952648 x = -3.626952648 Simplifying x = -3.626952648

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.376952648, -3.626952648}

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