x^2+18x=300

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Solution for x^2+18x=300 equation:


Simplifying
x2 + 18x = 300

Reorder the terms:
18x + x2 = 300

Solving
18x + x2 = 300

Solving for variable 'x'.

Reorder the terms:
-300 + 18x + x2 = 300 + -300

Combine like terms: 300 + -300 = 0
-300 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '300' to each side of the equation.
-300 + 18x + 300 + x2 = 0 + 300

Reorder the terms:
-300 + 300 + 18x + x2 = 0 + 300

Combine like terms: -300 + 300 = 0
0 + 18x + x2 = 0 + 300
18x + x2 = 0 + 300

Combine like terms: 0 + 300 = 300
18x + x2 = 300

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 = 300 + 81

Reorder the terms:
81 + 18x + x2 = 300 + 81

Combine like terms: 300 + 81 = 381
81 + 18x + x2 = 381

Factor a perfect square on the left side:
(x + 9)(x + 9) = 381

Calculate the square root of the right side: 19.519221296

Break this problem into two subproblems by setting 
(x + 9) equal to 19.519221296 and -19.519221296.

Subproblem 1

x + 9 = 19.519221296 Simplifying x + 9 = 19.519221296 Reorder the terms: 9 + x = 19.519221296 Solving 9 + x = 19.519221296 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 = 19.519221296 + -9 Combine like terms: 9 + -9 = 0 0 + x = 19.519221296 + -9 x = 19.519221296 + -9 Combine like terms: 19.519221296 + -9 = 10.519221296 x = 10.519221296 Simplifying x = 10.519221296

Subproblem 2

x + 9 = -19.519221296 Simplifying x + 9 = -19.519221296 Reorder the terms: 9 + x = -19.519221296 Solving 9 + x = -19.519221296 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 = -19.519221296 + -9 Combine like terms: 9 + -9 = 0 0 + x = -19.519221296 + -9 x = -19.519221296 + -9 Combine like terms: -19.519221296 + -9 = -28.519221296 x = -28.519221296 Simplifying x = -28.519221296

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.519221296, -28.519221296}

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