-x^2+6x+120=0

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Solution for -x^2+6x+120=0 equation:


Simplifying
-1x2 + 6x + 120 = 0

Reorder the terms:
120 + 6x + -1x2 = 0

Solving
120 + 6x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
-120 + -6x + x2 = 0

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + -6x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + -6x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + -6x + x2 = 0 + 120
-6x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
-6x + x2 = 120

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 120 + 9

Reorder the terms:
9 + -6x + x2 = 120 + 9

Combine like terms: 120 + 9 = 129
9 + -6x + x2 = 129

Factor a perfect square on the left side:
(x + -3)(x + -3) = 129

Calculate the square root of the right side: 11.357816692

Break this problem into two subproblems by setting 
(x + -3) equal to 11.357816692 and -11.357816692.

Subproblem 1

x + -3 = 11.357816692 Simplifying x + -3 = 11.357816692 Reorder the terms: -3 + x = 11.357816692 Solving -3 + x = 11.357816692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 11.357816692 + 3 Combine like terms: -3 + 3 = 0 0 + x = 11.357816692 + 3 x = 11.357816692 + 3 Combine like terms: 11.357816692 + 3 = 14.357816692 x = 14.357816692 Simplifying x = 14.357816692

Subproblem 2

x + -3 = -11.357816692 Simplifying x + -3 = -11.357816692 Reorder the terms: -3 + x = -11.357816692 Solving -3 + x = -11.357816692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -11.357816692 + 3 Combine like terms: -3 + 3 = 0 0 + x = -11.357816692 + 3 x = -11.357816692 + 3 Combine like terms: -11.357816692 + 3 = -8.357816692 x = -8.357816692 Simplifying x = -8.357816692

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.357816692, -8.357816692}

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