2x-5(2x)=(4x+1)(x-3)

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Solution for 2x-5(2x)=(4x+1)(x-3) equation:


Simplifying
2x + -5(2x) = (4x + 1)(x + -3)

Remove parenthesis around (2x)
2x + -5 * 2x = (4x + 1)(x + -3)

Multiply -5 * 2
2x + -10x = (4x + 1)(x + -3)

Combine like terms: 2x + -10x = -8x
-8x = (4x + 1)(x + -3)

Reorder the terms:
-8x = (1 + 4x)(x + -3)

Reorder the terms:
-8x = (1 + 4x)(-3 + x)

Multiply (1 + 4x) * (-3 + x)
-8x = (1(-3 + x) + 4x * (-3 + x))
-8x = ((-3 * 1 + x * 1) + 4x * (-3 + x))
-8x = ((-3 + 1x) + 4x * (-3 + x))
-8x = (-3 + 1x + (-3 * 4x + x * 4x))
-8x = (-3 + 1x + (-12x + 4x2))

Combine like terms: 1x + -12x = -11x
-8x = (-3 + -11x + 4x2)

Solving
-8x = -3 + -11x + 4x2

Solving for variable 'x'.

Reorder the terms:
3 + -8x + 11x + -4x2 = -3 + -11x + 4x2 + 3 + 11x + -4x2

Combine like terms: -8x + 11x = 3x
3 + 3x + -4x2 = -3 + -11x + 4x2 + 3 + 11x + -4x2

Reorder the terms:
3 + 3x + -4x2 = -3 + 3 + -11x + 11x + 4x2 + -4x2

Combine like terms: -3 + 3 = 0
3 + 3x + -4x2 = 0 + -11x + 11x + 4x2 + -4x2
3 + 3x + -4x2 = -11x + 11x + 4x2 + -4x2

Combine like terms: -11x + 11x = 0
3 + 3x + -4x2 = 0 + 4x2 + -4x2
3 + 3x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
3 + 3x + -4x2 = 0

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

Divide each side by '-4'.
-0.75 + -0.75x + x2 = 0

Move the constant term to the right:

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

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

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -0.75x + x2 = 0 + 0.75
-0.75x + x2 = 0 + 0.75

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

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 = 0.75 + 0.140625

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

Combine like terms: 0.75 + 0.140625 = 0.890625
0.140625 + -0.75x + x2 = 0.890625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 0.890625

Calculate the square root of the right side: 0.943729304

Break this problem into two subproblems by setting 
(x + -0.375) equal to 0.943729304 and -0.943729304.

Subproblem 1

x + -0.375 = 0.943729304 Simplifying x + -0.375 = 0.943729304 Reorder the terms: -0.375 + x = 0.943729304 Solving -0.375 + x = 0.943729304 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 = 0.943729304 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 0.943729304 + 0.375 x = 0.943729304 + 0.375 Combine like terms: 0.943729304 + 0.375 = 1.318729304 x = 1.318729304 Simplifying x = 1.318729304

Subproblem 2

x + -0.375 = -0.943729304 Simplifying x + -0.375 = -0.943729304 Reorder the terms: -0.375 + x = -0.943729304 Solving -0.375 + x = -0.943729304 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 = -0.943729304 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -0.943729304 + 0.375 x = -0.943729304 + 0.375 Combine like terms: -0.943729304 + 0.375 = -0.568729304 x = -0.568729304 Simplifying x = -0.568729304

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.318729304, -0.568729304}

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