55=x^2-12x

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Solution for 55=x^2-12x equation:


Simplifying
55 = x2 + -12x

Reorder the terms:
55 = -12x + x2

Solving
55 = -12x + x2

Solving for variable 'x'.

Reorder the terms:
55 + 12x + -1x2 = -12x + 12x + x2 + -1x2

Combine like terms: -12x + 12x = 0
55 + 12x + -1x2 = 0 + x2 + -1x2
55 + 12x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
55 + 12x + -1x2 = 0

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

Divide each side by '-1'.
-55 + -12x + x2 = 0

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + -12x + 55 + x2 = 0 + 55

Reorder the terms:
-55 + 55 + -12x + x2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + -12x + x2 = 0 + 55
-12x + x2 = 0 + 55

Combine like terms: 0 + 55 = 55
-12x + x2 = 55

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 = 55 + 36

Reorder the terms:
36 + -12x + x2 = 55 + 36

Combine like terms: 55 + 36 = 91
36 + -12x + x2 = 91

Factor a perfect square on the left side:
(x + -6)(x + -6) = 91

Calculate the square root of the right side: 9.539392014

Break this problem into two subproblems by setting 
(x + -6) equal to 9.539392014 and -9.539392014.

Subproblem 1

x + -6 = 9.539392014 Simplifying x + -6 = 9.539392014 Reorder the terms: -6 + x = 9.539392014 Solving -6 + x = 9.539392014 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 = 9.539392014 + 6 Combine like terms: -6 + 6 = 0 0 + x = 9.539392014 + 6 x = 9.539392014 + 6 Combine like terms: 9.539392014 + 6 = 15.539392014 x = 15.539392014 Simplifying x = 15.539392014

Subproblem 2

x + -6 = -9.539392014 Simplifying x + -6 = -9.539392014 Reorder the terms: -6 + x = -9.539392014 Solving -6 + x = -9.539392014 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 = -9.539392014 + 6 Combine like terms: -6 + 6 = 0 0 + x = -9.539392014 + 6 x = -9.539392014 + 6 Combine like terms: -9.539392014 + 6 = -3.539392014 x = -3.539392014 Simplifying x = -3.539392014

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.539392014, -3.539392014}

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