x^2-120x=-2780

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Solution for x^2-120x=-2780 equation:


Simplifying
x2 + -120x = -2780

Reorder the terms:
-120x + x2 = -2780

Solving
-120x + x2 = -2780

Solving for variable 'x'.

Reorder the terms:
2780 + -120x + x2 = -2780 + 2780

Combine like terms: -2780 + 2780 = 0
2780 + -120x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2780' to each side of the equation.
2780 + -120x + -2780 + x2 = 0 + -2780

Reorder the terms:
2780 + -2780 + -120x + x2 = 0 + -2780

Combine like terms: 2780 + -2780 = 0
0 + -120x + x2 = 0 + -2780
-120x + x2 = 0 + -2780

Combine like terms: 0 + -2780 = -2780
-120x + x2 = -2780

The x term is -120x.  Take half its coefficient (-60).
Square it (3600) and add it to both sides.

Add '3600' to each side of the equation.
-120x + 3600 + x2 = -2780 + 3600

Reorder the terms:
3600 + -120x + x2 = -2780 + 3600

Combine like terms: -2780 + 3600 = 820
3600 + -120x + x2 = 820

Factor a perfect square on the left side:
(x + -60)(x + -60) = 820

Calculate the square root of the right side: 28.635642127

Break this problem into two subproblems by setting 
(x + -60) equal to 28.635642127 and -28.635642127.

Subproblem 1

x + -60 = 28.635642127 Simplifying x + -60 = 28.635642127 Reorder the terms: -60 + x = 28.635642127 Solving -60 + x = 28.635642127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '60' to each side of the equation. -60 + 60 + x = 28.635642127 + 60 Combine like terms: -60 + 60 = 0 0 + x = 28.635642127 + 60 x = 28.635642127 + 60 Combine like terms: 28.635642127 + 60 = 88.635642127 x = 88.635642127 Simplifying x = 88.635642127

Subproblem 2

x + -60 = -28.635642127 Simplifying x + -60 = -28.635642127 Reorder the terms: -60 + x = -28.635642127 Solving -60 + x = -28.635642127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '60' to each side of the equation. -60 + 60 + x = -28.635642127 + 60 Combine like terms: -60 + 60 = 0 0 + x = -28.635642127 + 60 x = -28.635642127 + 60 Combine like terms: -28.635642127 + 60 = 31.364357873 x = 31.364357873 Simplifying x = 31.364357873

Solution

The solution to the problem is based on the solutions from the subproblems. x = {88.635642127, 31.364357873}

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