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

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


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

Reorder the terms:
3x(2 + 8x) = 8 + -5x
(2 * 3x + 8x * 3x) = 8 + -5x
(6x + 24x2) = 8 + -5x

Solving
6x + 24x2 = 8 + -5x

Solving for variable 'x'.

Reorder the terms:
-8 + 6x + 5x + 24x2 = 8 + -5x + -8 + 5x

Combine like terms: 6x + 5x = 11x
-8 + 11x + 24x2 = 8 + -5x + -8 + 5x

Reorder the terms:
-8 + 11x + 24x2 = 8 + -8 + -5x + 5x

Combine like terms: 8 + -8 = 0
-8 + 11x + 24x2 = 0 + -5x + 5x
-8 + 11x + 24x2 = -5x + 5x

Combine like terms: -5x + 5x = 0
-8 + 11x + 24x2 = 0

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

Divide each side by '24'.
-0.3333333333 + 0.4583333333x + x2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + 0.4583333333x + 0.3333333333 + x2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + 0.4583333333x + x2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + 0.4583333333x + x2 = 0 + 0.3333333333
0.4583333333x + x2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
0.4583333333x + x2 = 0.3333333333

The x term is 0.4583333333x.  Take half its coefficient (0.2291666667).
Square it (0.05251736113) and add it to both sides.

Add '0.05251736113' to each side of the equation.
0.4583333333x + 0.05251736113 + x2 = 0.3333333333 + 0.05251736113

Reorder the terms:
0.05251736113 + 0.4583333333x + x2 = 0.3333333333 + 0.05251736113

Combine like terms: 0.3333333333 + 0.05251736113 = 0.38585069443
0.05251736113 + 0.4583333333x + x2 = 0.38585069443

Factor a perfect square on the left side:
(x + 0.2291666667)(x + 0.2291666667) = 0.38585069443

Calculate the square root of the right side: 0.621168813

Break this problem into two subproblems by setting 
(x + 0.2291666667) equal to 0.621168813 and -0.621168813.

Subproblem 1

x + 0.2291666667 = 0.621168813 Simplifying x + 0.2291666667 = 0.621168813 Reorder the terms: 0.2291666667 + x = 0.621168813 Solving 0.2291666667 + x = 0.621168813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2291666667' to each side of the equation. 0.2291666667 + -0.2291666667 + x = 0.621168813 + -0.2291666667 Combine like terms: 0.2291666667 + -0.2291666667 = 0.0000000000 0.0000000000 + x = 0.621168813 + -0.2291666667 x = 0.621168813 + -0.2291666667 Combine like terms: 0.621168813 + -0.2291666667 = 0.3920021463 x = 0.3920021463 Simplifying x = 0.3920021463

Subproblem 2

x + 0.2291666667 = -0.621168813 Simplifying x + 0.2291666667 = -0.621168813 Reorder the terms: 0.2291666667 + x = -0.621168813 Solving 0.2291666667 + x = -0.621168813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2291666667' to each side of the equation. 0.2291666667 + -0.2291666667 + x = -0.621168813 + -0.2291666667 Combine like terms: 0.2291666667 + -0.2291666667 = 0.0000000000 0.0000000000 + x = -0.621168813 + -0.2291666667 x = -0.621168813 + -0.2291666667 Combine like terms: -0.621168813 + -0.2291666667 = -0.8503354797 x = -0.8503354797 Simplifying x = -0.8503354797

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3920021463, -0.8503354797}

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