(4x-7)(3x+8)=1

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Solution for (4x-7)(3x+8)=1 equation:


Simplifying
(4x + -7)(3x + 8) = 1

Reorder the terms:
(-7 + 4x)(3x + 8) = 1

Reorder the terms:
(-7 + 4x)(8 + 3x) = 1

Multiply (-7 + 4x) * (8 + 3x)
(-7(8 + 3x) + 4x * (8 + 3x)) = 1
((8 * -7 + 3x * -7) + 4x * (8 + 3x)) = 1
((-56 + -21x) + 4x * (8 + 3x)) = 1
(-56 + -21x + (8 * 4x + 3x * 4x)) = 1
(-56 + -21x + (32x + 12x2)) = 1

Combine like terms: -21x + 32x = 11x
(-56 + 11x + 12x2) = 1

Solving
-56 + 11x + 12x2 = 1

Solving for variable 'x'.

Reorder the terms:
-56 + -1 + 11x + 12x2 = 1 + -1

Combine like terms: -56 + -1 = -57
-57 + 11x + 12x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-57 + 11x + 12x2 = 0

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

Divide each side by '12'.
-4.75 + 0.9166666667x + x2 = 0

Move the constant term to the right:

Add '4.75' to each side of the equation.
-4.75 + 0.9166666667x + 4.75 + x2 = 0 + 4.75

Reorder the terms:
-4.75 + 4.75 + 0.9166666667x + x2 = 0 + 4.75

Combine like terms: -4.75 + 4.75 = 0.00
0.00 + 0.9166666667x + x2 = 0 + 4.75
0.9166666667x + x2 = 0 + 4.75

Combine like terms: 0 + 4.75 = 4.75
0.9166666667x + x2 = 4.75

The x term is 0.9166666667x.  Take half its coefficient (0.4583333334).
Square it (0.2100694445) and add it to both sides.

Add '0.2100694445' to each side of the equation.
0.9166666667x + 0.2100694445 + x2 = 4.75 + 0.2100694445

Reorder the terms:
0.2100694445 + 0.9166666667x + x2 = 4.75 + 0.2100694445

Combine like terms: 4.75 + 0.2100694445 = 4.9600694445
0.2100694445 + 0.9166666667x + x2 = 4.9600694445

Factor a perfect square on the left side:
(x + 0.4583333334)(x + 0.4583333334) = 4.9600694445

Calculate the square root of the right side: 2.227121336

Break this problem into two subproblems by setting 
(x + 0.4583333334) equal to 2.227121336 and -2.227121336.

Subproblem 1

x + 0.4583333334 = 2.227121336 Simplifying x + 0.4583333334 = 2.227121336 Reorder the terms: 0.4583333334 + x = 2.227121336 Solving 0.4583333334 + x = 2.227121336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4583333334' to each side of the equation. 0.4583333334 + -0.4583333334 + x = 2.227121336 + -0.4583333334 Combine like terms: 0.4583333334 + -0.4583333334 = 0.0000000000 0.0000000000 + x = 2.227121336 + -0.4583333334 x = 2.227121336 + -0.4583333334 Combine like terms: 2.227121336 + -0.4583333334 = 1.7687880026 x = 1.7687880026 Simplifying x = 1.7687880026

Subproblem 2

x + 0.4583333334 = -2.227121336 Simplifying x + 0.4583333334 = -2.227121336 Reorder the terms: 0.4583333334 + x = -2.227121336 Solving 0.4583333334 + x = -2.227121336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4583333334' to each side of the equation. 0.4583333334 + -0.4583333334 + x = -2.227121336 + -0.4583333334 Combine like terms: 0.4583333334 + -0.4583333334 = 0.0000000000 0.0000000000 + x = -2.227121336 + -0.4583333334 x = -2.227121336 + -0.4583333334 Combine like terms: -2.227121336 + -0.4583333334 = -2.6854546694 x = -2.6854546694 Simplifying x = -2.6854546694

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.7687880026, -2.6854546694}

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