3x(2x-1)+4=5(5+2x)-8

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Solution for 3x(2x-1)+4=5(5+2x)-8 equation:


Simplifying
3x(2x + -1) + 4 = 5(5 + 2x) + -8

Reorder the terms:
3x(-1 + 2x) + 4 = 5(5 + 2x) + -8
(-1 * 3x + 2x * 3x) + 4 = 5(5 + 2x) + -8
(-3x + 6x2) + 4 = 5(5 + 2x) + -8

Reorder the terms:
4 + -3x + 6x2 = 5(5 + 2x) + -8
4 + -3x + 6x2 = (5 * 5 + 2x * 5) + -8
4 + -3x + 6x2 = (25 + 10x) + -8

Reorder the terms:
4 + -3x + 6x2 = 25 + -8 + 10x

Combine like terms: 25 + -8 = 17
4 + -3x + 6x2 = 17 + 10x

Solving
4 + -3x + 6x2 = 17 + 10x

Solving for variable 'x'.

Reorder the terms:
4 + -17 + -3x + -10x + 6x2 = 17 + 10x + -17 + -10x

Combine like terms: 4 + -17 = -13
-13 + -3x + -10x + 6x2 = 17 + 10x + -17 + -10x

Combine like terms: -3x + -10x = -13x
-13 + -13x + 6x2 = 17 + 10x + -17 + -10x

Reorder the terms:
-13 + -13x + 6x2 = 17 + -17 + 10x + -10x

Combine like terms: 17 + -17 = 0
-13 + -13x + 6x2 = 0 + 10x + -10x
-13 + -13x + 6x2 = 10x + -10x

Combine like terms: 10x + -10x = 0
-13 + -13x + 6x2 = 0

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

Divide each side by '6'.
-2.166666667 + -2.166666667x + x2 = 0

Move the constant term to the right:

Add '2.166666667' to each side of the equation.
-2.166666667 + -2.166666667x + 2.166666667 + x2 = 0 + 2.166666667

Reorder the terms:
-2.166666667 + 2.166666667 + -2.166666667x + x2 = 0 + 2.166666667

Combine like terms: -2.166666667 + 2.166666667 = 0.000000000
0.000000000 + -2.166666667x + x2 = 0 + 2.166666667
-2.166666667x + x2 = 0 + 2.166666667

Combine like terms: 0 + 2.166666667 = 2.166666667
-2.166666667x + x2 = 2.166666667

The x term is -2.166666667x.  Take half its coefficient (-1.083333334).
Square it (1.173611113) and add it to both sides.

Add '1.173611113' to each side of the equation.
-2.166666667x + 1.173611113 + x2 = 2.166666667 + 1.173611113

Reorder the terms:
1.173611113 + -2.166666667x + x2 = 2.166666667 + 1.173611113

Combine like terms: 2.166666667 + 1.173611113 = 3.34027778
1.173611113 + -2.166666667x + x2 = 3.34027778

Factor a perfect square on the left side:
(x + -1.083333334)(x + -1.083333334) = 3.34027778

Calculate the square root of the right side: 1.827642684

Break this problem into two subproblems by setting 
(x + -1.083333334) equal to 1.827642684 and -1.827642684.

Subproblem 1

x + -1.083333334 = 1.827642684 Simplifying x + -1.083333334 = 1.827642684 Reorder the terms: -1.083333334 + x = 1.827642684 Solving -1.083333334 + x = 1.827642684 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.083333334' to each side of the equation. -1.083333334 + 1.083333334 + x = 1.827642684 + 1.083333334 Combine like terms: -1.083333334 + 1.083333334 = 0.000000000 0.000000000 + x = 1.827642684 + 1.083333334 x = 1.827642684 + 1.083333334 Combine like terms: 1.827642684 + 1.083333334 = 2.910976018 x = 2.910976018 Simplifying x = 2.910976018

Subproblem 2

x + -1.083333334 = -1.827642684 Simplifying x + -1.083333334 = -1.827642684 Reorder the terms: -1.083333334 + x = -1.827642684 Solving -1.083333334 + x = -1.827642684 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.083333334' to each side of the equation. -1.083333334 + 1.083333334 + x = -1.827642684 + 1.083333334 Combine like terms: -1.083333334 + 1.083333334 = 0.000000000 0.000000000 + x = -1.827642684 + 1.083333334 x = -1.827642684 + 1.083333334 Combine like terms: -1.827642684 + 1.083333334 = -0.74430935 x = -0.74430935 Simplifying x = -0.74430935

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.910976018, -0.74430935}

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