x^2+18x+25=0

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Solution for x^2+18x+25=0 equation:


Simplifying
x2 + 18x + 25 = 0

Reorder the terms:
25 + 18x + x2 = 0

Solving
25 + 18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + 18x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + 18x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + 18x + x2 = 0 + -25
18x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
18x + x2 = -25

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 = -25 + 81

Reorder the terms:
81 + 18x + x2 = -25 + 81

Combine like terms: -25 + 81 = 56
81 + 18x + x2 = 56

Factor a perfect square on the left side:
(x + 9)(x + 9) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(x + 9) equal to 7.483314774 and -7.483314774.

Subproblem 1

x + 9 = 7.483314774 Simplifying x + 9 = 7.483314774 Reorder the terms: 9 + x = 7.483314774 Solving 9 + x = 7.483314774 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 = 7.483314774 + -9 Combine like terms: 9 + -9 = 0 0 + x = 7.483314774 + -9 x = 7.483314774 + -9 Combine like terms: 7.483314774 + -9 = -1.516685226 x = -1.516685226 Simplifying x = -1.516685226

Subproblem 2

x + 9 = -7.483314774 Simplifying x + 9 = -7.483314774 Reorder the terms: 9 + x = -7.483314774 Solving 9 + x = -7.483314774 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 = -7.483314774 + -9 Combine like terms: 9 + -9 = 0 0 + x = -7.483314774 + -9 x = -7.483314774 + -9 Combine like terms: -7.483314774 + -9 = -16.483314774 x = -16.483314774 Simplifying x = -16.483314774

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.516685226, -16.483314774}

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