X^2-X-366=0

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Solution for X^2-X-366=0 equation:


Simplifying
X2 + -1X + -366 = 0

Reorder the terms:
-366 + -1X + X2 = 0

Solving
-366 + -1X + X2 = 0

Solving for variable 'X'.

Begin completing the square.

Move the constant term to the right:

Add '366' to each side of the equation.
-366 + -1X + 366 + X2 = 0 + 366

Reorder the terms:
-366 + 366 + -1X + X2 = 0 + 366

Combine like terms: -366 + 366 = 0
0 + -1X + X2 = 0 + 366
-1X + X2 = 0 + 366

Combine like terms: 0 + 366 = 366
-1X + X2 = 366

The X term is -1X.  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.
-1X + 0.25 + X2 = 366 + 0.25

Reorder the terms:
0.25 + -1X + X2 = 366 + 0.25

Combine like terms: 366 + 0.25 = 366.25
0.25 + -1X + X2 = 366.25

Factor a perfect square on the left side:
(X + -0.5)(X + -0.5) = 366.25

Calculate the square root of the right side: 19.137659209

Break this problem into two subproblems by setting 
(X + -0.5) equal to 19.137659209 and -19.137659209.

Subproblem 1

X + -0.5 = 19.137659209 Simplifying X + -0.5 = 19.137659209 Reorder the terms: -0.5 + X = 19.137659209 Solving -0.5 + X = 19.137659209 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 = 19.137659209 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + X = 19.137659209 + 0.5 X = 19.137659209 + 0.5 Combine like terms: 19.137659209 + 0.5 = 19.637659209 X = 19.637659209 Simplifying X = 19.637659209

Subproblem 2

X + -0.5 = -19.137659209 Simplifying X + -0.5 = -19.137659209 Reorder the terms: -0.5 + X = -19.137659209 Solving -0.5 + X = -19.137659209 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 = -19.137659209 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + X = -19.137659209 + 0.5 X = -19.137659209 + 0.5 Combine like terms: -19.137659209 + 0.5 = -18.637659209 X = -18.637659209 Simplifying X = -18.637659209

Solution

The solution to the problem is based on the solutions from the subproblems. X = {19.637659209, -18.637659209}

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