x^2-20x=39

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Solution for x^2-20x=39 equation:


Simplifying
x2 + -20x = 39

Reorder the terms:
-20x + x2 = 39

Solving
-20x + x2 = 39

Solving for variable 'x'.

Reorder the terms:
-39 + -20x + x2 = 39 + -39

Combine like terms: 39 + -39 = 0
-39 + -20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + -20x + 39 + x2 = 0 + 39

Reorder the terms:
-39 + 39 + -20x + x2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + -20x + x2 = 0 + 39
-20x + x2 = 0 + 39

Combine like terms: 0 + 39 = 39
-20x + x2 = 39

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 = 39 + 100

Reorder the terms:
100 + -20x + x2 = 39 + 100

Combine like terms: 39 + 100 = 139
100 + -20x + x2 = 139

Factor a perfect square on the left side:
(x + -10)(x + -10) = 139

Calculate the square root of the right side: 11.789826123

Break this problem into two subproblems by setting 
(x + -10) equal to 11.789826123 and -11.789826123.

Subproblem 1

x + -10 = 11.789826123 Simplifying x + -10 = 11.789826123 Reorder the terms: -10 + x = 11.789826123 Solving -10 + x = 11.789826123 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 = 11.789826123 + 10 Combine like terms: -10 + 10 = 0 0 + x = 11.789826123 + 10 x = 11.789826123 + 10 Combine like terms: 11.789826123 + 10 = 21.789826123 x = 21.789826123 Simplifying x = 21.789826123

Subproblem 2

x + -10 = -11.789826123 Simplifying x + -10 = -11.789826123 Reorder the terms: -10 + x = -11.789826123 Solving -10 + x = -11.789826123 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 = -11.789826123 + 10 Combine like terms: -10 + 10 = 0 0 + x = -11.789826123 + 10 x = -11.789826123 + 10 Combine like terms: -11.789826123 + 10 = -1.789826123 x = -1.789826123 Simplifying x = -1.789826123

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.789826123, -1.789826123}

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