0=x^2-20x-35

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Solution for 0=x^2-20x-35 equation:


Simplifying
0 = x2 + -20x + -35

Reorder the terms:
0 = -35 + -20x + x2

Solving
0 = -35 + -20x + x2

Solving for variable 'x'.

Combine like terms: 0 + 35 = 35
35 + 20x + -1x2 = -35 + -20x + x2 + 35 + 20x + -1x2

Reorder the terms:
35 + 20x + -1x2 = -35 + 35 + -20x + 20x + x2 + -1x2

Combine like terms: -35 + 35 = 0
35 + 20x + -1x2 = 0 + -20x + 20x + x2 + -1x2
35 + 20x + -1x2 = -20x + 20x + x2 + -1x2

Combine like terms: -20x + 20x = 0
35 + 20x + -1x2 = 0 + x2 + -1x2
35 + 20x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
35 + 20x + -1x2 = 0

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

Divide each side by '-1'.
-35 + -20x + x2 = 0

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + -20x + 35 + x2 = 0 + 35

Reorder the terms:
-35 + 35 + -20x + x2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + -20x + x2 = 0 + 35
-20x + x2 = 0 + 35

Combine like terms: 0 + 35 = 35
-20x + x2 = 35

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 = 35 + 100

Reorder the terms:
100 + -20x + x2 = 35 + 100

Combine like terms: 35 + 100 = 135
100 + -20x + x2 = 135

Factor a perfect square on the left side:
(x + -10)(x + -10) = 135

Calculate the square root of the right side: 11.618950039

Break this problem into two subproblems by setting 
(x + -10) equal to 11.618950039 and -11.618950039.

Subproblem 1

x + -10 = 11.618950039 Simplifying x + -10 = 11.618950039 Reorder the terms: -10 + x = 11.618950039 Solving -10 + x = 11.618950039 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 = 11.618950039 + 10 Combine like terms: -10 + 10 = 0 0 + x = 11.618950039 + 10 x = 11.618950039 + 10 Combine like terms: 11.618950039 + 10 = 21.618950039 x = 21.618950039 Simplifying x = 21.618950039

Subproblem 2

x + -10 = -11.618950039 Simplifying x + -10 = -11.618950039 Reorder the terms: -10 + x = -11.618950039 Solving -10 + x = -11.618950039 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 = -11.618950039 + 10 Combine like terms: -10 + 10 = 0 0 + x = -11.618950039 + 10 x = -11.618950039 + 10 Combine like terms: -11.618950039 + 10 = -1.618950039 x = -1.618950039 Simplifying x = -1.618950039

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.618950039, -1.618950039}

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