0=x^2-12x-36

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Solution for 0=x^2-12x-36 equation:


Simplifying
0 = x2 + -12x + -36

Reorder the terms:
0 = -36 + -12x + x2

Solving
0 = -36 + -12x + x2

Solving for variable 'x'.

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

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

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

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

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

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

Divide each side by '-1'.
-36 + -12x + x2 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -12x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + -12x + x2 = 0 + 36

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

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

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 = 36 + 36

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

Combine like terms: 36 + 36 = 72
36 + -12x + x2 = 72

Factor a perfect square on the left side:
(x + -6)(x + -6) = 72

Calculate the square root of the right side: 8.485281374

Break this problem into two subproblems by setting 
(x + -6) equal to 8.485281374 and -8.485281374.

Subproblem 1

x + -6 = 8.485281374 Simplifying x + -6 = 8.485281374 Reorder the terms: -6 + x = 8.485281374 Solving -6 + x = 8.485281374 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 = 8.485281374 + 6 Combine like terms: -6 + 6 = 0 0 + x = 8.485281374 + 6 x = 8.485281374 + 6 Combine like terms: 8.485281374 + 6 = 14.485281374 x = 14.485281374 Simplifying x = 14.485281374

Subproblem 2

x + -6 = -8.485281374 Simplifying x + -6 = -8.485281374 Reorder the terms: -6 + x = -8.485281374 Solving -6 + x = -8.485281374 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 = -8.485281374 + 6 Combine like terms: -6 + 6 = 0 0 + x = -8.485281374 + 6 x = -8.485281374 + 6 Combine like terms: -8.485281374 + 6 = -2.485281374 x = -2.485281374 Simplifying x = -2.485281374

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.485281374, -2.485281374}

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