12x-13x(x+4)=4x-6

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Solution for 12x-13x(x+4)=4x-6 equation:


Simplifying
12x + -13x(x + 4) = 4x + -6

Reorder the terms:
12x + -13x(4 + x) = 4x + -6
12x + (4 * -13x + x * -13x) = 4x + -6
12x + (-52x + -13x2) = 4x + -6

Combine like terms: 12x + -52x = -40x
-40x + -13x2 = 4x + -6

Reorder the terms:
-40x + -13x2 = -6 + 4x

Solving
-40x + -13x2 = -6 + 4x

Solving for variable 'x'.

Reorder the terms:
6 + -40x + -4x + -13x2 = -6 + 4x + 6 + -4x

Combine like terms: -40x + -4x = -44x
6 + -44x + -13x2 = -6 + 4x + 6 + -4x

Reorder the terms:
6 + -44x + -13x2 = -6 + 6 + 4x + -4x

Combine like terms: -6 + 6 = 0
6 + -44x + -13x2 = 0 + 4x + -4x
6 + -44x + -13x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
6 + -44x + -13x2 = 0

Begin completing the square.  Divide all terms by
-13 the coefficient of the squared term: 

Divide each side by '-13'.
-0.4615384615 + 3.384615385x + x2 = 0

Move the constant term to the right:

Add '0.4615384615' to each side of the equation.
-0.4615384615 + 3.384615385x + 0.4615384615 + x2 = 0 + 0.4615384615

Reorder the terms:
-0.4615384615 + 0.4615384615 + 3.384615385x + x2 = 0 + 0.4615384615

Combine like terms: -0.4615384615 + 0.4615384615 = 0.0000000000
0.0000000000 + 3.384615385x + x2 = 0 + 0.4615384615
3.384615385x + x2 = 0 + 0.4615384615

Combine like terms: 0 + 0.4615384615 = 0.4615384615
3.384615385x + x2 = 0.4615384615

The x term is 3.384615385x.  Take half its coefficient (1.692307693).
Square it (2.863905328) and add it to both sides.

Add '2.863905328' to each side of the equation.
3.384615385x + 2.863905328 + x2 = 0.4615384615 + 2.863905328

Reorder the terms:
2.863905328 + 3.384615385x + x2 = 0.4615384615 + 2.863905328

Combine like terms: 0.4615384615 + 2.863905328 = 3.3254437895
2.863905328 + 3.384615385x + x2 = 3.3254437895

Factor a perfect square on the left side:
(x + 1.692307693)(x + 1.692307693) = 3.3254437895

Calculate the square root of the right side: 1.823579938

Break this problem into two subproblems by setting 
(x + 1.692307693) equal to 1.823579938 and -1.823579938.

Subproblem 1

x + 1.692307693 = 1.823579938 Simplifying x + 1.692307693 = 1.823579938 Reorder the terms: 1.692307693 + x = 1.823579938 Solving 1.692307693 + x = 1.823579938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.692307693' to each side of the equation. 1.692307693 + -1.692307693 + x = 1.823579938 + -1.692307693 Combine like terms: 1.692307693 + -1.692307693 = 0.000000000 0.000000000 + x = 1.823579938 + -1.692307693 x = 1.823579938 + -1.692307693 Combine like terms: 1.823579938 + -1.692307693 = 0.131272245 x = 0.131272245 Simplifying x = 0.131272245

Subproblem 2

x + 1.692307693 = -1.823579938 Simplifying x + 1.692307693 = -1.823579938 Reorder the terms: 1.692307693 + x = -1.823579938 Solving 1.692307693 + x = -1.823579938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.692307693' to each side of the equation. 1.692307693 + -1.692307693 + x = -1.823579938 + -1.692307693 Combine like terms: 1.692307693 + -1.692307693 = 0.000000000 0.000000000 + x = -1.823579938 + -1.692307693 x = -1.823579938 + -1.692307693 Combine like terms: -1.823579938 + -1.692307693 = -3.515887631 x = -3.515887631 Simplifying x = -3.515887631

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.131272245, -3.515887631}

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