x^2+18x+58=0

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Solution for x^2+18x+58=0 equation:


Simplifying
x2 + 18x + 58 = 0

Reorder the terms:
58 + 18x + x2 = 0

Solving
58 + 18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-58' to each side of the equation.
58 + 18x + -58 + x2 = 0 + -58

Reorder the terms:
58 + -58 + 18x + x2 = 0 + -58

Combine like terms: 58 + -58 = 0
0 + 18x + x2 = 0 + -58
18x + x2 = 0 + -58

Combine like terms: 0 + -58 = -58
18x + x2 = -58

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 = -58 + 81

Reorder the terms:
81 + 18x + x2 = -58 + 81

Combine like terms: -58 + 81 = 23
81 + 18x + x2 = 23

Factor a perfect square on the left side:
(x + 9)(x + 9) = 23

Calculate the square root of the right side: 4.795831523

Break this problem into two subproblems by setting 
(x + 9) equal to 4.795831523 and -4.795831523.

Subproblem 1

x + 9 = 4.795831523 Simplifying x + 9 = 4.795831523 Reorder the terms: 9 + x = 4.795831523 Solving 9 + x = 4.795831523 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 = 4.795831523 + -9 Combine like terms: 9 + -9 = 0 0 + x = 4.795831523 + -9 x = 4.795831523 + -9 Combine like terms: 4.795831523 + -9 = -4.204168477 x = -4.204168477 Simplifying x = -4.204168477

Subproblem 2

x + 9 = -4.795831523 Simplifying x + 9 = -4.795831523 Reorder the terms: 9 + x = -4.795831523 Solving 9 + x = -4.795831523 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 = -4.795831523 + -9 Combine like terms: 9 + -9 = 0 0 + x = -4.795831523 + -9 x = -4.795831523 + -9 Combine like terms: -4.795831523 + -9 = -13.795831523 x = -13.795831523 Simplifying x = -13.795831523

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.204168477, -13.795831523}

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