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

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


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

Reorder the terms:
3x(-4 + x) + 6 = x + 4
(-4 * 3x + x * 3x) + 6 = x + 4
(-12x + 3x2) + 6 = x + 4

Reorder the terms:
6 + -12x + 3x2 = x + 4

Reorder the terms:
6 + -12x + 3x2 = 4 + x

Solving
6 + -12x + 3x2 = 4 + x

Solving for variable 'x'.

Reorder the terms:
6 + -4 + -12x + -1x + 3x2 = 4 + x + -4 + -1x

Combine like terms: 6 + -4 = 2
2 + -12x + -1x + 3x2 = 4 + x + -4 + -1x

Combine like terms: -12x + -1x = -13x
2 + -13x + 3x2 = 4 + x + -4 + -1x

Reorder the terms:
2 + -13x + 3x2 = 4 + -4 + x + -1x

Combine like terms: 4 + -4 = 0
2 + -13x + 3x2 = 0 + x + -1x
2 + -13x + 3x2 = x + -1x

Combine like terms: x + -1x = 0
2 + -13x + 3x2 = 0

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

Divide each side by '3'.
0.6666666667 + -4.333333333x + x2 = 0

Move the constant term to the right:

Add '-0.6666666667' to each side of the equation.
0.6666666667 + -4.333333333x + -0.6666666667 + x2 = 0 + -0.6666666667

Reorder the terms:
0.6666666667 + -0.6666666667 + -4.333333333x + x2 = 0 + -0.6666666667

Combine like terms: 0.6666666667 + -0.6666666667 = 0.0000000000
0.0000000000 + -4.333333333x + x2 = 0 + -0.6666666667
-4.333333333x + x2 = 0 + -0.6666666667

Combine like terms: 0 + -0.6666666667 = -0.6666666667
-4.333333333x + x2 = -0.6666666667

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 = -0.6666666667 + 4.694444446

Reorder the terms:
4.694444446 + -4.333333333x + x2 = -0.6666666667 + 4.694444446

Combine like terms: -0.6666666667 + 4.694444446 = 4.0277777793
4.694444446 + -4.333333333x + x2 = 4.0277777793

Factor a perfect square on the left side:
(x + -2.166666667)(x + -2.166666667) = 4.0277777793

Calculate the square root of the right side: 2.00693243

Break this problem into two subproblems by setting 
(x + -2.166666667) equal to 2.00693243 and -2.00693243.

Subproblem 1

x + -2.166666667 = 2.00693243 Simplifying x + -2.166666667 = 2.00693243 Reorder the terms: -2.166666667 + x = 2.00693243 Solving -2.166666667 + x = 2.00693243 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 = 2.00693243 + 2.166666667 Combine like terms: -2.166666667 + 2.166666667 = 0.000000000 0.000000000 + x = 2.00693243 + 2.166666667 x = 2.00693243 + 2.166666667 Combine like terms: 2.00693243 + 2.166666667 = 4.173599097 x = 4.173599097 Simplifying x = 4.173599097

Subproblem 2

x + -2.166666667 = -2.00693243 Simplifying x + -2.166666667 = -2.00693243 Reorder the terms: -2.166666667 + x = -2.00693243 Solving -2.166666667 + x = -2.00693243 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 = -2.00693243 + 2.166666667 Combine like terms: -2.166666667 + 2.166666667 = 0.000000000 0.000000000 + x = -2.00693243 + 2.166666667 x = -2.00693243 + 2.166666667 Combine like terms: -2.00693243 + 2.166666667 = 0.159734237 x = 0.159734237 Simplifying x = 0.159734237

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.173599097, 0.159734237}

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