x^2-12x-120=0

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Solution for x^2-12x-120=0 equation:


Simplifying
x2 + -12x + -120 = 0

Reorder the terms:
-120 + -12x + x2 = 0

Solving
-120 + -12x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + -12x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + -12x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + -12x + x2 = 0 + 120
-12x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
-12x + x2 = 120

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 = 120 + 36

Reorder the terms:
36 + -12x + x2 = 120 + 36

Combine like terms: 120 + 36 = 156
36 + -12x + x2 = 156

Factor a perfect square on the left side:
(x + -6)(x + -6) = 156

Calculate the square root of the right side: 12.489995997

Break this problem into two subproblems by setting 
(x + -6) equal to 12.489995997 and -12.489995997.

Subproblem 1

x + -6 = 12.489995997 Simplifying x + -6 = 12.489995997 Reorder the terms: -6 + x = 12.489995997 Solving -6 + x = 12.489995997 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 = 12.489995997 + 6 Combine like terms: -6 + 6 = 0 0 + x = 12.489995997 + 6 x = 12.489995997 + 6 Combine like terms: 12.489995997 + 6 = 18.489995997 x = 18.489995997 Simplifying x = 18.489995997

Subproblem 2

x + -6 = -12.489995997 Simplifying x + -6 = -12.489995997 Reorder the terms: -6 + x = -12.489995997 Solving -6 + x = -12.489995997 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 = -12.489995997 + 6 Combine like terms: -6 + 6 = 0 0 + x = -12.489995997 + 6 x = -12.489995997 + 6 Combine like terms: -12.489995997 + 6 = -6.489995997 x = -6.489995997 Simplifying x = -6.489995997

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.489995997, -6.489995997}

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