(3x+6)(x-4)=8

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Solution for (3x+6)(x-4)=8 equation:


Simplifying
(3x + 6)(x + -4) = 8

Reorder the terms:
(6 + 3x)(x + -4) = 8

Reorder the terms:
(6 + 3x)(-4 + x) = 8

Multiply (6 + 3x) * (-4 + x)
(6(-4 + x) + 3x * (-4 + x)) = 8
((-4 * 6 + x * 6) + 3x * (-4 + x)) = 8
((-24 + 6x) + 3x * (-4 + x)) = 8
(-24 + 6x + (-4 * 3x + x * 3x)) = 8
(-24 + 6x + (-12x + 3x2)) = 8

Combine like terms: 6x + -12x = -6x
(-24 + -6x + 3x2) = 8

Solving
-24 + -6x + 3x2 = 8

Solving for variable 'x'.

Reorder the terms:
-24 + -8 + -6x + 3x2 = 8 + -8

Combine like terms: -24 + -8 = -32
-32 + -6x + 3x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-32 + -6x + 3x2 = 0

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

Divide each side by '3'.
-10.66666667 + -2x + x2 = 0

Move the constant term to the right:

Add '10.66666667' to each side of the equation.
-10.66666667 + -2x + 10.66666667 + x2 = 0 + 10.66666667

Reorder the terms:
-10.66666667 + 10.66666667 + -2x + x2 = 0 + 10.66666667

Combine like terms: -10.66666667 + 10.66666667 = 0.00000000
0.00000000 + -2x + x2 = 0 + 10.66666667
-2x + x2 = 0 + 10.66666667

Combine like terms: 0 + 10.66666667 = 10.66666667
-2x + x2 = 10.66666667

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 10.66666667 + 1

Reorder the terms:
1 + -2x + x2 = 10.66666667 + 1

Combine like terms: 10.66666667 + 1 = 11.66666667
1 + -2x + x2 = 11.66666667

Factor a perfect square on the left side:
(x + -1)(x + -1) = 11.66666667

Calculate the square root of the right side: 3.415650256

Break this problem into two subproblems by setting 
(x + -1) equal to 3.415650256 and -3.415650256.

Subproblem 1

x + -1 = 3.415650256 Simplifying x + -1 = 3.415650256 Reorder the terms: -1 + x = 3.415650256 Solving -1 + x = 3.415650256 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 3.415650256 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.415650256 + 1 x = 3.415650256 + 1 Combine like terms: 3.415650256 + 1 = 4.415650256 x = 4.415650256 Simplifying x = 4.415650256

Subproblem 2

x + -1 = -3.415650256 Simplifying x + -1 = -3.415650256 Reorder the terms: -1 + x = -3.415650256 Solving -1 + x = -3.415650256 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -3.415650256 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.415650256 + 1 x = -3.415650256 + 1 Combine like terms: -3.415650256 + 1 = -2.415650256 x = -2.415650256 Simplifying x = -2.415650256

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.415650256, -2.415650256}

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