x^2-12x=18

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Solution for x^2-12x=18 equation:


Simplifying
x2 + -12x = 18

Reorder the terms:
-12x + x2 = 18

Solving
-12x + x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + -12x + x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + -12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -12x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + -12x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -12x + x2 = 0 + 18
-12x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-12x + x2 = 18

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 = 18 + 36

Reorder the terms:
36 + -12x + x2 = 18 + 36

Combine like terms: 18 + 36 = 54
36 + -12x + x2 = 54

Factor a perfect square on the left side:
(x + -6)(x + -6) = 54

Calculate the square root of the right side: 7.348469228

Break this problem into two subproblems by setting 
(x + -6) equal to 7.348469228 and -7.348469228.

Subproblem 1

x + -6 = 7.348469228 Simplifying x + -6 = 7.348469228 Reorder the terms: -6 + x = 7.348469228 Solving -6 + x = 7.348469228 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 = 7.348469228 + 6 Combine like terms: -6 + 6 = 0 0 + x = 7.348469228 + 6 x = 7.348469228 + 6 Combine like terms: 7.348469228 + 6 = 13.348469228 x = 13.348469228 Simplifying x = 13.348469228

Subproblem 2

x + -6 = -7.348469228 Simplifying x + -6 = -7.348469228 Reorder the terms: -6 + x = -7.348469228 Solving -6 + x = -7.348469228 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 = -7.348469228 + 6 Combine like terms: -6 + 6 = 0 0 + x = -7.348469228 + 6 x = -7.348469228 + 6 Combine like terms: -7.348469228 + 6 = -1.348469228 x = -1.348469228 Simplifying x = -1.348469228

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.348469228, -1.348469228}

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