(4x-7)(2x+1)=2x

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Solution for (4x-7)(2x+1)=2x equation:


Simplifying
(4x + -7)(2x + 1) = 2x

Reorder the terms:
(-7 + 4x)(2x + 1) = 2x

Reorder the terms:
(-7 + 4x)(1 + 2x) = 2x

Multiply (-7 + 4x) * (1 + 2x)
(-7(1 + 2x) + 4x * (1 + 2x)) = 2x
((1 * -7 + 2x * -7) + 4x * (1 + 2x)) = 2x
((-7 + -14x) + 4x * (1 + 2x)) = 2x
(-7 + -14x + (1 * 4x + 2x * 4x)) = 2x
(-7 + -14x + (4x + 8x2)) = 2x

Combine like terms: -14x + 4x = -10x
(-7 + -10x + 8x2) = 2x

Solving
-7 + -10x + 8x2 = 2x

Solving for variable 'x'.

Reorder the terms:
-7 + -10x + -2x + 8x2 = 2x + -2x

Combine like terms: -10x + -2x = -12x
-7 + -12x + 8x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-7 + -12x + 8x2 = 0

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

Divide each side by '8'.
-0.875 + -1.5x + x2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + -1.5x + 0.875 + x2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + -1.5x + x2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + -1.5x + x2 = 0 + 0.875
-1.5x + x2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
-1.5x + x2 = 0.875

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 0.875 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 0.875 + 0.5625

Combine like terms: 0.875 + 0.5625 = 1.4375
0.5625 + -1.5x + x2 = 1.4375

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 1.4375

Calculate the square root of the right side: 1.198957881

Break this problem into two subproblems by setting 
(x + -0.75) equal to 1.198957881 and -1.198957881.

Subproblem 1

x + -0.75 = 1.198957881 Simplifying x + -0.75 = 1.198957881 Reorder the terms: -0.75 + x = 1.198957881 Solving -0.75 + x = 1.198957881 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 1.198957881 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 1.198957881 + 0.75 x = 1.198957881 + 0.75 Combine like terms: 1.198957881 + 0.75 = 1.948957881 x = 1.948957881 Simplifying x = 1.948957881

Subproblem 2

x + -0.75 = -1.198957881 Simplifying x + -0.75 = -1.198957881 Reorder the terms: -0.75 + x = -1.198957881 Solving -0.75 + x = -1.198957881 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -1.198957881 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -1.198957881 + 0.75 x = -1.198957881 + 0.75 Combine like terms: -1.198957881 + 0.75 = -0.448957881 x = -0.448957881 Simplifying x = -0.448957881

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.948957881, -0.448957881}

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