x^2-12x+4=9

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Solution for x^2-12x+4=9 equation:


Simplifying
x2 + -12x + 4 = 9

Reorder the terms:
4 + -12x + x2 = 9

Solving
4 + -12x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
4 + -9 + -12x + x2 = 9 + -9

Combine like terms: 4 + -9 = -5
-5 + -12x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-5 + -12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -12x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -12x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -12x + x2 = 0 + 5
-12x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-12x + x2 = 5

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 = 5 + 36

Reorder the terms:
36 + -12x + x2 = 5 + 36

Combine like terms: 5 + 36 = 41
36 + -12x + x2 = 41

Factor a perfect square on the left side:
(x + -6)(x + -6) = 41

Calculate the square root of the right side: 6.403124237

Break this problem into two subproblems by setting 
(x + -6) equal to 6.403124237 and -6.403124237.

Subproblem 1

x + -6 = 6.403124237 Simplifying x + -6 = 6.403124237 Reorder the terms: -6 + x = 6.403124237 Solving -6 + x = 6.403124237 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 = 6.403124237 + 6 Combine like terms: -6 + 6 = 0 0 + x = 6.403124237 + 6 x = 6.403124237 + 6 Combine like terms: 6.403124237 + 6 = 12.403124237 x = 12.403124237 Simplifying x = 12.403124237

Subproblem 2

x + -6 = -6.403124237 Simplifying x + -6 = -6.403124237 Reorder the terms: -6 + x = -6.403124237 Solving -6 + x = -6.403124237 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 = -6.403124237 + 6 Combine like terms: -6 + 6 = 0 0 + x = -6.403124237 + 6 x = -6.403124237 + 6 Combine like terms: -6.403124237 + 6 = -0.403124237 x = -0.403124237 Simplifying x = -0.403124237

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.403124237, -0.403124237}

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