0=x^2-20x+60

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Solution for 0=x^2-20x+60 equation:


Simplifying
0 = x2 + -20x + 60

Reorder the terms:
0 = 60 + -20x + x2

Solving
0 = 60 + -20x + x2

Solving for variable 'x'.

Combine like terms: 0 + -60 = -60
-60 + 20x + -1x2 = 60 + -20x + x2 + -60 + 20x + -1x2

Reorder the terms:
-60 + 20x + -1x2 = 60 + -60 + -20x + 20x + x2 + -1x2

Combine like terms: 60 + -60 = 0
-60 + 20x + -1x2 = 0 + -20x + 20x + x2 + -1x2
-60 + 20x + -1x2 = -20x + 20x + x2 + -1x2

Combine like terms: -20x + 20x = 0
-60 + 20x + -1x2 = 0 + x2 + -1x2
-60 + 20x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-60 + 20x + -1x2 = 0

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

Divide each side by '-1'.
60 + -20x + x2 = 0

Move the constant term to the right:

Add '-60' to each side of the equation.
60 + -20x + -60 + x2 = 0 + -60

Reorder the terms:
60 + -60 + -20x + x2 = 0 + -60

Combine like terms: 60 + -60 = 0
0 + -20x + x2 = 0 + -60
-20x + x2 = 0 + -60

Combine like terms: 0 + -60 = -60
-20x + x2 = -60

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = -60 + 100

Reorder the terms:
100 + -20x + x2 = -60 + 100

Combine like terms: -60 + 100 = 40
100 + -20x + x2 = 40

Factor a perfect square on the left side:
(x + -10)(x + -10) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(x + -10) equal to 6.32455532 and -6.32455532.

Subproblem 1

x + -10 = 6.32455532 Simplifying x + -10 = 6.32455532 Reorder the terms: -10 + x = 6.32455532 Solving -10 + x = 6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 6.32455532 + 10 Combine like terms: -10 + 10 = 0 0 + x = 6.32455532 + 10 x = 6.32455532 + 10 Combine like terms: 6.32455532 + 10 = 16.32455532 x = 16.32455532 Simplifying x = 16.32455532

Subproblem 2

x + -10 = -6.32455532 Simplifying x + -10 = -6.32455532 Reorder the terms: -10 + x = -6.32455532 Solving -10 + x = -6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -6.32455532 + 10 Combine like terms: -10 + 10 = 0 0 + x = -6.32455532 + 10 x = -6.32455532 + 10 Combine like terms: -6.32455532 + 10 = 3.67544468 x = 3.67544468 Simplifying x = 3.67544468

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.32455532, 3.67544468}

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