12x=x^2-4

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Solution for 12x=x^2-4 equation:


Simplifying
12x = x2 + -4

Reorder the terms:
12x = -4 + x2

Solving
12x = -4 + x2

Solving for variable 'x'.

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

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

Combine like terms: -4 + 4 = 0
4 + 12x + -1x2 = 0 + x2 + -1x2
4 + 12x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
4 + 12x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-4 + -12x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -12x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -12x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -12x + x2 = 0 + 4
-12x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-12x + x2 = 4

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = 4 + 36

Reorder the terms:
36 + -12x + x2 = 4 + 36

Combine like terms: 4 + 36 = 40
36 + -12x + x2 = 40

Factor a perfect square on the left side:
(x + -6)(x + -6) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(x + -6) equal to 6.32455532 and -6.32455532.

Subproblem 1

x + -6 = 6.32455532 Simplifying x + -6 = 6.32455532 Reorder the terms: -6 + x = 6.32455532 Solving -6 + x = 6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 6.32455532 + 6 Combine like terms: -6 + 6 = 0 0 + x = 6.32455532 + 6 x = 6.32455532 + 6 Combine like terms: 6.32455532 + 6 = 12.32455532 x = 12.32455532 Simplifying x = 12.32455532

Subproblem 2

x + -6 = -6.32455532 Simplifying x + -6 = -6.32455532 Reorder the terms: -6 + x = -6.32455532 Solving -6 + x = -6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -6.32455532 + 6 Combine like terms: -6 + 6 = 0 0 + x = -6.32455532 + 6 x = -6.32455532 + 6 Combine like terms: -6.32455532 + 6 = -0.32455532 x = -0.32455532 Simplifying x = -0.32455532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.32455532, -0.32455532}

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