x^2+x-324=0

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Solution for x^2+x-324=0 equation:


Simplifying
x2 + x + -324 = 0

Reorder the terms:
-324 + x + x2 = 0

Solving
-324 + x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '324' to each side of the equation.
-324 + x + 324 + x2 = 0 + 324

Reorder the terms:
-324 + 324 + x + x2 = 0 + 324

Combine like terms: -324 + 324 = 0
0 + x + x2 = 0 + 324
x + x2 = 0 + 324

Combine like terms: 0 + 324 = 324
x + x2 = 324

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 324 + 0.25

Reorder the terms:
0.25 + x + x2 = 324 + 0.25

Combine like terms: 324 + 0.25 = 324.25
0.25 + x + x2 = 324.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 324.25

Calculate the square root of the right side: 18.006943105

Break this problem into two subproblems by setting 
(x + 0.5) equal to 18.006943105 and -18.006943105.

Subproblem 1

x + 0.5 = 18.006943105 Simplifying x + 0.5 = 18.006943105 Reorder the terms: 0.5 + x = 18.006943105 Solving 0.5 + x = 18.006943105 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 18.006943105 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 18.006943105 + -0.5 x = 18.006943105 + -0.5 Combine like terms: 18.006943105 + -0.5 = 17.506943105 x = 17.506943105 Simplifying x = 17.506943105

Subproblem 2

x + 0.5 = -18.006943105 Simplifying x + 0.5 = -18.006943105 Reorder the terms: 0.5 + x = -18.006943105 Solving 0.5 + x = -18.006943105 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -18.006943105 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -18.006943105 + -0.5 x = -18.006943105 + -0.5 Combine like terms: -18.006943105 + -0.5 = -18.506943105 x = -18.506943105 Simplifying x = -18.506943105

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.506943105, -18.506943105}

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