(8x+5)(3x+1)-12=4

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Solution for (8x+5)(3x+1)-12=4 equation:


Simplifying
(8x + 5)(3x + 1) + -12 = 4

Reorder the terms:
(5 + 8x)(3x + 1) + -12 = 4

Reorder the terms:
(5 + 8x)(1 + 3x) + -12 = 4

Multiply (5 + 8x) * (1 + 3x)
(5(1 + 3x) + 8x * (1 + 3x)) + -12 = 4
((1 * 5 + 3x * 5) + 8x * (1 + 3x)) + -12 = 4
((5 + 15x) + 8x * (1 + 3x)) + -12 = 4
(5 + 15x + (1 * 8x + 3x * 8x)) + -12 = 4
(5 + 15x + (8x + 24x2)) + -12 = 4

Combine like terms: 15x + 8x = 23x
(5 + 23x + 24x2) + -12 = 4

Reorder the terms:
5 + -12 + 23x + 24x2 = 4

Combine like terms: 5 + -12 = -7
-7 + 23x + 24x2 = 4

Solving
-7 + 23x + 24x2 = 4

Solving for variable 'x'.

Reorder the terms:
-7 + -4 + 23x + 24x2 = 4 + -4

Combine like terms: -7 + -4 = -11
-11 + 23x + 24x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-11 + 23x + 24x2 = 0

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

Divide each side by '24'.
-0.4583333333 + 0.9583333333x + x2 = 0

Move the constant term to the right:

Add '0.4583333333' to each side of the equation.
-0.4583333333 + 0.9583333333x + 0.4583333333 + x2 = 0 + 0.4583333333

Reorder the terms:
-0.4583333333 + 0.4583333333 + 0.9583333333x + x2 = 0 + 0.4583333333

Combine like terms: -0.4583333333 + 0.4583333333 = 0.0000000000
0.0000000000 + 0.9583333333x + x2 = 0 + 0.4583333333
0.9583333333x + x2 = 0 + 0.4583333333

Combine like terms: 0 + 0.4583333333 = 0.4583333333
0.9583333333x + x2 = 0.4583333333

The x term is 0.9583333333x.  Take half its coefficient (0.4791666667).
Square it (0.2296006945) and add it to both sides.

Add '0.2296006945' to each side of the equation.
0.9583333333x + 0.2296006945 + x2 = 0.4583333333 + 0.2296006945

Reorder the terms:
0.2296006945 + 0.9583333333x + x2 = 0.4583333333 + 0.2296006945

Combine like terms: 0.4583333333 + 0.2296006945 = 0.6879340278
0.2296006945 + 0.9583333333x + x2 = 0.6879340278

Factor a perfect square on the left side:
(x + 0.4791666667)(x + 0.4791666667) = 0.6879340278

Calculate the square root of the right side: 0.829417885

Break this problem into two subproblems by setting 
(x + 0.4791666667) equal to 0.829417885 and -0.829417885.

Subproblem 1

x + 0.4791666667 = 0.829417885 Simplifying x + 0.4791666667 = 0.829417885 Reorder the terms: 0.4791666667 + x = 0.829417885 Solving 0.4791666667 + x = 0.829417885 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4791666667' to each side of the equation. 0.4791666667 + -0.4791666667 + x = 0.829417885 + -0.4791666667 Combine like terms: 0.4791666667 + -0.4791666667 = 0.0000000000 0.0000000000 + x = 0.829417885 + -0.4791666667 x = 0.829417885 + -0.4791666667 Combine like terms: 0.829417885 + -0.4791666667 = 0.3502512183 x = 0.3502512183 Simplifying x = 0.3502512183

Subproblem 2

x + 0.4791666667 = -0.829417885 Simplifying x + 0.4791666667 = -0.829417885 Reorder the terms: 0.4791666667 + x = -0.829417885 Solving 0.4791666667 + x = -0.829417885 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4791666667' to each side of the equation. 0.4791666667 + -0.4791666667 + x = -0.829417885 + -0.4791666667 Combine like terms: 0.4791666667 + -0.4791666667 = 0.0000000000 0.0000000000 + x = -0.829417885 + -0.4791666667 x = -0.829417885 + -0.4791666667 Combine like terms: -0.829417885 + -0.4791666667 = -1.3085845517 x = -1.3085845517 Simplifying x = -1.3085845517

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3502512183, -1.3085845517}

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