2x+120=x^2-6x

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


Simplifying
2x + 120 = x2 + -6x

Reorder the terms:
120 + 2x = x2 + -6x

Reorder the terms:
120 + 2x = -6x + x2

Solving
120 + 2x = -6x + x2

Solving for variable 'x'.

Combine like terms: 2x + 6x = 8x
120 + 8x + -1x2 = -6x + x2 + 6x + -1x2

Reorder the terms:
120 + 8x + -1x2 = -6x + 6x + x2 + -1x2

Combine like terms: -6x + 6x = 0
120 + 8x + -1x2 = 0 + x2 + -1x2
120 + 8x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
120 + 8x + -1x2 = 0

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

Divide each side by '-1'.
-120 + -8x + x2 = 0

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + -8x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + -8x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + -8x + x2 = 0 + 120
-8x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
-8x + x2 = 120

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 120 + 16

Reorder the terms:
16 + -8x + x2 = 120 + 16

Combine like terms: 120 + 16 = 136
16 + -8x + x2 = 136

Factor a perfect square on the left side:
(x + -4)(x + -4) = 136

Calculate the square root of the right side: 11.66190379

Break this problem into two subproblems by setting 
(x + -4) equal to 11.66190379 and -11.66190379.

Subproblem 1

x + -4 = 11.66190379 Simplifying x + -4 = 11.66190379 Reorder the terms: -4 + x = 11.66190379 Solving -4 + x = 11.66190379 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 11.66190379 + 4 Combine like terms: -4 + 4 = 0 0 + x = 11.66190379 + 4 x = 11.66190379 + 4 Combine like terms: 11.66190379 + 4 = 15.66190379 x = 15.66190379 Simplifying x = 15.66190379

Subproblem 2

x + -4 = -11.66190379 Simplifying x + -4 = -11.66190379 Reorder the terms: -4 + x = -11.66190379 Solving -4 + x = -11.66190379 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -11.66190379 + 4 Combine like terms: -4 + 4 = 0 0 + x = -11.66190379 + 4 x = -11.66190379 + 4 Combine like terms: -11.66190379 + 4 = -7.66190379 x = -7.66190379 Simplifying x = -7.66190379

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.66190379, -7.66190379}

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