x^2=12x+54

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Solution for x^2=12x+54 equation:


Simplifying
x2 = 12x + 54

Reorder the terms:
x2 = 54 + 12x

Solving
x2 = 54 + 12x

Solving for variable 'x'.

Reorder the terms:
-54 + -12x + x2 = 54 + 12x + -54 + -12x

Reorder the terms:
-54 + -12x + x2 = 54 + -54 + 12x + -12x

Combine like terms: 54 + -54 = 0
-54 + -12x + x2 = 0 + 12x + -12x
-54 + -12x + x2 = 12x + -12x

Combine like terms: 12x + -12x = 0
-54 + -12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '54' to each side of the equation.
-54 + -12x + 54 + x2 = 0 + 54

Reorder the terms:
-54 + 54 + -12x + x2 = 0 + 54

Combine like terms: -54 + 54 = 0
0 + -12x + x2 = 0 + 54
-12x + x2 = 0 + 54

Combine like terms: 0 + 54 = 54
-12x + x2 = 54

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 = 54 + 36

Reorder the terms:
36 + -12x + x2 = 54 + 36

Combine like terms: 54 + 36 = 90
36 + -12x + x2 = 90

Factor a perfect square on the left side:
(x + -6)(x + -6) = 90

Calculate the square root of the right side: 9.486832981

Break this problem into two subproblems by setting 
(x + -6) equal to 9.486832981 and -9.486832981.

Subproblem 1

x + -6 = 9.486832981 Simplifying x + -6 = 9.486832981 Reorder the terms: -6 + x = 9.486832981 Solving -6 + x = 9.486832981 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 = 9.486832981 + 6 Combine like terms: -6 + 6 = 0 0 + x = 9.486832981 + 6 x = 9.486832981 + 6 Combine like terms: 9.486832981 + 6 = 15.486832981 x = 15.486832981 Simplifying x = 15.486832981

Subproblem 2

x + -6 = -9.486832981 Simplifying x + -6 = -9.486832981 Reorder the terms: -6 + x = -9.486832981 Solving -6 + x = -9.486832981 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 = -9.486832981 + 6 Combine like terms: -6 + 6 = 0 0 + x = -9.486832981 + 6 x = -9.486832981 + 6 Combine like terms: -9.486832981 + 6 = -3.486832981 x = -3.486832981 Simplifying x = -3.486832981

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.486832981, -3.486832981}

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