x^2+18x-104=0

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Solution for x^2+18x-104=0 equation:


Simplifying
x2 + 18x + -104 = 0

Reorder the terms:
-104 + 18x + x2 = 0

Solving
-104 + 18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '104' to each side of the equation.
-104 + 18x + 104 + x2 = 0 + 104

Reorder the terms:
-104 + 104 + 18x + x2 = 0 + 104

Combine like terms: -104 + 104 = 0
0 + 18x + x2 = 0 + 104
18x + x2 = 0 + 104

Combine like terms: 0 + 104 = 104
18x + x2 = 104

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = 104 + 81

Reorder the terms:
81 + 18x + x2 = 104 + 81

Combine like terms: 104 + 81 = 185
81 + 18x + x2 = 185

Factor a perfect square on the left side:
(x + 9)(x + 9) = 185

Calculate the square root of the right side: 13.601470509

Break this problem into two subproblems by setting 
(x + 9) equal to 13.601470509 and -13.601470509.

Subproblem 1

x + 9 = 13.601470509 Simplifying x + 9 = 13.601470509 Reorder the terms: 9 + x = 13.601470509 Solving 9 + x = 13.601470509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 13.601470509 + -9 Combine like terms: 9 + -9 = 0 0 + x = 13.601470509 + -9 x = 13.601470509 + -9 Combine like terms: 13.601470509 + -9 = 4.601470509 x = 4.601470509 Simplifying x = 4.601470509

Subproblem 2

x + 9 = -13.601470509 Simplifying x + 9 = -13.601470509 Reorder the terms: 9 + x = -13.601470509 Solving 9 + x = -13.601470509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -13.601470509 + -9 Combine like terms: 9 + -9 = 0 0 + x = -13.601470509 + -9 x = -13.601470509 + -9 Combine like terms: -13.601470509 + -9 = -22.601470509 x = -22.601470509 Simplifying x = -22.601470509

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.601470509, -22.601470509}

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