x^2-36x-20=0

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Solution for x^2-36x-20=0 equation:


Simplifying
x2 + -36x + -20 = 0

Reorder the terms:
-20 + -36x + x2 = 0

Solving
-20 + -36x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -36x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -36x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -36x + x2 = 0 + 20
-36x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-36x + x2 = 20

The x term is -36x.  Take half its coefficient (-18).
Square it (324) and add it to both sides.

Add '324' to each side of the equation.
-36x + 324 + x2 = 20 + 324

Reorder the terms:
324 + -36x + x2 = 20 + 324

Combine like terms: 20 + 324 = 344
324 + -36x + x2 = 344

Factor a perfect square on the left side:
(x + -18)(x + -18) = 344

Calculate the square root of the right side: 18.547236991

Break this problem into two subproblems by setting 
(x + -18) equal to 18.547236991 and -18.547236991.

Subproblem 1

x + -18 = 18.547236991 Simplifying x + -18 = 18.547236991 Reorder the terms: -18 + x = 18.547236991 Solving -18 + x = 18.547236991 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + x = 18.547236991 + 18 Combine like terms: -18 + 18 = 0 0 + x = 18.547236991 + 18 x = 18.547236991 + 18 Combine like terms: 18.547236991 + 18 = 36.547236991 x = 36.547236991 Simplifying x = 36.547236991

Subproblem 2

x + -18 = -18.547236991 Simplifying x + -18 = -18.547236991 Reorder the terms: -18 + x = -18.547236991 Solving -18 + x = -18.547236991 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + x = -18.547236991 + 18 Combine like terms: -18 + 18 = 0 0 + x = -18.547236991 + 18 x = -18.547236991 + 18 Combine like terms: -18.547236991 + 18 = -0.547236991 x = -0.547236991 Simplifying x = -0.547236991

Solution

The solution to the problem is based on the solutions from the subproblems. x = {36.547236991, -0.547236991}

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