(3x-4)(x+6)=x+12

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Solution for (3x-4)(x+6)=x+12 equation:


Simplifying
(3x + -4)(x + 6) = x + 12

Reorder the terms:
(-4 + 3x)(x + 6) = x + 12

Reorder the terms:
(-4 + 3x)(6 + x) = x + 12

Multiply (-4 + 3x) * (6 + x)
(-4(6 + x) + 3x * (6 + x)) = x + 12
((6 * -4 + x * -4) + 3x * (6 + x)) = x + 12
((-24 + -4x) + 3x * (6 + x)) = x + 12
(-24 + -4x + (6 * 3x + x * 3x)) = x + 12
(-24 + -4x + (18x + 3x2)) = x + 12

Combine like terms: -4x + 18x = 14x
(-24 + 14x + 3x2) = x + 12

Reorder the terms:
-24 + 14x + 3x2 = 12 + x

Solving
-24 + 14x + 3x2 = 12 + x

Solving for variable 'x'.

Reorder the terms:
-24 + -12 + 14x + -1x + 3x2 = 12 + x + -12 + -1x

Combine like terms: -24 + -12 = -36
-36 + 14x + -1x + 3x2 = 12 + x + -12 + -1x

Combine like terms: 14x + -1x = 13x
-36 + 13x + 3x2 = 12 + x + -12 + -1x

Reorder the terms:
-36 + 13x + 3x2 = 12 + -12 + x + -1x

Combine like terms: 12 + -12 = 0
-36 + 13x + 3x2 = 0 + x + -1x
-36 + 13x + 3x2 = x + -1x

Combine like terms: x + -1x = 0
-36 + 13x + 3x2 = 0

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

Divide each side by '3'.
-12 + 4.333333333x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 4.333333333x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 4.333333333x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 4.333333333x + x2 = 0 + 12
4.333333333x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
4.333333333x + x2 = 12

The x term is 4.333333333x.  Take half its coefficient (2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
4.333333333x + 4.694444446 + x2 = 12 + 4.694444446

Reorder the terms:
4.694444446 + 4.333333333x + x2 = 12 + 4.694444446

Combine like terms: 12 + 4.694444446 = 16.694444446
4.694444446 + 4.333333333x + x2 = 16.694444446

Factor a perfect square on the left side:
(x + 2.166666667)(x + 2.166666667) = 16.694444446

Calculate the square root of the right side: 4.085883558

Break this problem into two subproblems by setting 
(x + 2.166666667) equal to 4.085883558 and -4.085883558.

Subproblem 1

x + 2.166666667 = 4.085883558 Simplifying x + 2.166666667 = 4.085883558 Reorder the terms: 2.166666667 + x = 4.085883558 Solving 2.166666667 + x = 4.085883558 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + x = 4.085883558 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + x = 4.085883558 + -2.166666667 x = 4.085883558 + -2.166666667 Combine like terms: 4.085883558 + -2.166666667 = 1.919216891 x = 1.919216891 Simplifying x = 1.919216891

Subproblem 2

x + 2.166666667 = -4.085883558 Simplifying x + 2.166666667 = -4.085883558 Reorder the terms: 2.166666667 + x = -4.085883558 Solving 2.166666667 + x = -4.085883558 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + x = -4.085883558 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + x = -4.085883558 + -2.166666667 x = -4.085883558 + -2.166666667 Combine like terms: -4.085883558 + -2.166666667 = -6.252550225 x = -6.252550225 Simplifying x = -6.252550225

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.919216891, -6.252550225}

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