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

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


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

Reorder the terms:
(-1 + 2x)(3x + 8) = 1

Reorder the terms:
(-1 + 2x)(8 + 3x) = 1

Multiply (-1 + 2x) * (8 + 3x)
(-1(8 + 3x) + 2x * (8 + 3x)) = 1
((8 * -1 + 3x * -1) + 2x * (8 + 3x)) = 1
((-8 + -3x) + 2x * (8 + 3x)) = 1
(-8 + -3x + (8 * 2x + 3x * 2x)) = 1
(-8 + -3x + (16x + 6x2)) = 1

Combine like terms: -3x + 16x = 13x
(-8 + 13x + 6x2) = 1

Solving
-8 + 13x + 6x2 = 1

Solving for variable 'x'.

Reorder the terms:
-8 + -1 + 13x + 6x2 = 1 + -1

Combine like terms: -8 + -1 = -9
-9 + 13x + 6x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-9 + 13x + 6x2 = 0

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

Divide each side by '6'.
-1.5 + 2.166666667x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 2.166666667x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 2.166666667x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 2.166666667x + x2 = 0 + 1.5
2.166666667x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
2.166666667x + x2 = 1.5

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 = 1.5 + 1.173611113

Reorder the terms:
1.173611113 + 2.166666667x + x2 = 1.5 + 1.173611113

Combine like terms: 1.5 + 1.173611113 = 2.673611113
1.173611113 + 2.166666667x + x2 = 2.673611113

Factor a perfect square on the left side:
(x + 1.083333334)(x + 1.083333334) = 2.673611113

Calculate the square root of the right side: 1.635118073

Break this problem into two subproblems by setting 
(x + 1.083333334) equal to 1.635118073 and -1.635118073.

Subproblem 1

x + 1.083333334 = 1.635118073 Simplifying x + 1.083333334 = 1.635118073 Reorder the terms: 1.083333334 + x = 1.635118073 Solving 1.083333334 + x = 1.635118073 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 = 1.635118073 + -1.083333334 Combine like terms: 1.083333334 + -1.083333334 = 0.000000000 0.000000000 + x = 1.635118073 + -1.083333334 x = 1.635118073 + -1.083333334 Combine like terms: 1.635118073 + -1.083333334 = 0.551784739 x = 0.551784739 Simplifying x = 0.551784739

Subproblem 2

x + 1.083333334 = -1.635118073 Simplifying x + 1.083333334 = -1.635118073 Reorder the terms: 1.083333334 + x = -1.635118073 Solving 1.083333334 + x = -1.635118073 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 = -1.635118073 + -1.083333334 Combine like terms: 1.083333334 + -1.083333334 = 0.000000000 0.000000000 + x = -1.635118073 + -1.083333334 x = -1.635118073 + -1.083333334 Combine like terms: -1.635118073 + -1.083333334 = -2.718451407 x = -2.718451407 Simplifying x = -2.718451407

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.551784739, -2.718451407}

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