x^2+18x+81=525

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Solution for x^2+18x+81=525 equation:


Simplifying
x2 + 18x + 81 = 525

Reorder the terms:
81 + 18x + x2 = 525

Solving
81 + 18x + x2 = 525

Solving for variable 'x'.

Reorder the terms:
81 + -525 + 18x + x2 = 525 + -525

Combine like terms: 81 + -525 = -444
-444 + 18x + x2 = 525 + -525

Combine like terms: 525 + -525 = 0
-444 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '444' to each side of the equation.
-444 + 18x + 444 + x2 = 0 + 444

Reorder the terms:
-444 + 444 + 18x + x2 = 0 + 444

Combine like terms: -444 + 444 = 0
0 + 18x + x2 = 0 + 444
18x + x2 = 0 + 444

Combine like terms: 0 + 444 = 444
18x + x2 = 444

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 = 444 + 81

Reorder the terms:
81 + 18x + x2 = 444 + 81

Combine like terms: 444 + 81 = 525
81 + 18x + x2 = 525

Factor a perfect square on the left side:
(x + 9)(x + 9) = 525

Calculate the square root of the right side: 22.912878475

Break this problem into two subproblems by setting 
(x + 9) equal to 22.912878475 and -22.912878475.

Subproblem 1

x + 9 = 22.912878475 Simplifying x + 9 = 22.912878475 Reorder the terms: 9 + x = 22.912878475 Solving 9 + x = 22.912878475 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 = 22.912878475 + -9 Combine like terms: 9 + -9 = 0 0 + x = 22.912878475 + -9 x = 22.912878475 + -9 Combine like terms: 22.912878475 + -9 = 13.912878475 x = 13.912878475 Simplifying x = 13.912878475

Subproblem 2

x + 9 = -22.912878475 Simplifying x + 9 = -22.912878475 Reorder the terms: 9 + x = -22.912878475 Solving 9 + x = -22.912878475 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 = -22.912878475 + -9 Combine like terms: 9 + -9 = 0 0 + x = -22.912878475 + -9 x = -22.912878475 + -9 Combine like terms: -22.912878475 + -9 = -31.912878475 x = -31.912878475 Simplifying x = -31.912878475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.912878475, -31.912878475}

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