120=(60-x)(x)

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Solution for 120=(60-x)(x) equation:


Simplifying
120 = (60 + -1x)(x)

Reorder the terms for easier multiplication:
120 = x(60 + -1x)
120 = (60 * x + -1x * x)
120 = (60x + -1x2)

Solving
120 = 60x + -1x2

Solving for variable 'x'.

Reorder the terms:
120 + -60x + x2 = 60x + -60x + -1x2 + x2

Combine like terms: 60x + -60x = 0
120 + -60x + x2 = 0 + -1x2 + x2
120 + -60x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
120 + -60x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-120' to each side of the equation.
120 + -60x + -120 + x2 = 0 + -120

Reorder the terms:
120 + -120 + -60x + x2 = 0 + -120

Combine like terms: 120 + -120 = 0
0 + -60x + x2 = 0 + -120
-60x + x2 = 0 + -120

Combine like terms: 0 + -120 = -120
-60x + x2 = -120

The x term is -60x.  Take half its coefficient (-30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
-60x + 900 + x2 = -120 + 900

Reorder the terms:
900 + -60x + x2 = -120 + 900

Combine like terms: -120 + 900 = 780
900 + -60x + x2 = 780

Factor a perfect square on the left side:
(x + -30)(x + -30) = 780

Calculate the square root of the right side: 27.928480088

Break this problem into two subproblems by setting 
(x + -30) equal to 27.928480088 and -27.928480088.

Subproblem 1

x + -30 = 27.928480088 Simplifying x + -30 = 27.928480088 Reorder the terms: -30 + x = 27.928480088 Solving -30 + x = 27.928480088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = 27.928480088 + 30 Combine like terms: -30 + 30 = 0 0 + x = 27.928480088 + 30 x = 27.928480088 + 30 Combine like terms: 27.928480088 + 30 = 57.928480088 x = 57.928480088 Simplifying x = 57.928480088

Subproblem 2

x + -30 = -27.928480088 Simplifying x + -30 = -27.928480088 Reorder the terms: -30 + x = -27.928480088 Solving -30 + x = -27.928480088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = -27.928480088 + 30 Combine like terms: -30 + 30 = 0 0 + x = -27.928480088 + 30 x = -27.928480088 + 30 Combine like terms: -27.928480088 + 30 = 2.071519912 x = 2.071519912 Simplifying x = 2.071519912

Solution

The solution to the problem is based on the solutions from the subproblems. x = {57.928480088, 2.071519912}

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