x^2+18x+81=24

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Solution for x^2+18x+81=24 equation:


Simplifying
x2 + 18x + 81 = 24

Reorder the terms:
81 + 18x + x2 = 24

Solving
81 + 18x + x2 = 24

Solving for variable 'x'.

Reorder the terms:
81 + -24 + 18x + x2 = 24 + -24

Combine like terms: 81 + -24 = 57
57 + 18x + x2 = 24 + -24

Combine like terms: 24 + -24 = 0
57 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-57' to each side of the equation.
57 + 18x + -57 + x2 = 0 + -57

Reorder the terms:
57 + -57 + 18x + x2 = 0 + -57

Combine like terms: 57 + -57 = 0
0 + 18x + x2 = 0 + -57
18x + x2 = 0 + -57

Combine like terms: 0 + -57 = -57
18x + x2 = -57

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 = -57 + 81

Reorder the terms:
81 + 18x + x2 = -57 + 81

Combine like terms: -57 + 81 = 24
81 + 18x + x2 = 24

Factor a perfect square on the left side:
(x + 9)(x + 9) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(x + 9) equal to 4.898979486 and -4.898979486.

Subproblem 1

x + 9 = 4.898979486 Simplifying x + 9 = 4.898979486 Reorder the terms: 9 + x = 4.898979486 Solving 9 + x = 4.898979486 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 = 4.898979486 + -9 Combine like terms: 9 + -9 = 0 0 + x = 4.898979486 + -9 x = 4.898979486 + -9 Combine like terms: 4.898979486 + -9 = -4.101020514 x = -4.101020514 Simplifying x = -4.101020514

Subproblem 2

x + 9 = -4.898979486 Simplifying x + 9 = -4.898979486 Reorder the terms: 9 + x = -4.898979486 Solving 9 + x = -4.898979486 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 = -4.898979486 + -9 Combine like terms: 9 + -9 = 0 0 + x = -4.898979486 + -9 x = -4.898979486 + -9 Combine like terms: -4.898979486 + -9 = -13.898979486 x = -13.898979486 Simplifying x = -13.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.101020514, -13.898979486}

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