0=x^2-3x-555

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Solution for 0=x^2-3x-555 equation:


Simplifying
0 = x2 + -3x + -555

Reorder the terms:
0 = -555 + -3x + x2

Solving
0 = -555 + -3x + x2

Solving for variable 'x'.

Combine like terms: 0 + 555 = 555
555 + 3x + -1x2 = -555 + -3x + x2 + 555 + 3x + -1x2

Reorder the terms:
555 + 3x + -1x2 = -555 + 555 + -3x + 3x + x2 + -1x2

Combine like terms: -555 + 555 = 0
555 + 3x + -1x2 = 0 + -3x + 3x + x2 + -1x2
555 + 3x + -1x2 = -3x + 3x + x2 + -1x2

Combine like terms: -3x + 3x = 0
555 + 3x + -1x2 = 0 + x2 + -1x2
555 + 3x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
555 + 3x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-555 + -3x + x2 = 0

Move the constant term to the right:

Add '555' to each side of the equation.
-555 + -3x + 555 + x2 = 0 + 555

Reorder the terms:
-555 + 555 + -3x + x2 = 0 + 555

Combine like terms: -555 + 555 = 0
0 + -3x + x2 = 0 + 555
-3x + x2 = 0 + 555

Combine like terms: 0 + 555 = 555
-3x + x2 = 555

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 555 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 555 + 2.25

Combine like terms: 555 + 2.25 = 557.25
2.25 + -3x + x2 = 557.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 557.25

Calculate the square root of the right side: 23.606143268

Break this problem into two subproblems by setting 
(x + -1.5) equal to 23.606143268 and -23.606143268.

Subproblem 1

x + -1.5 = 23.606143268 Simplifying x + -1.5 = 23.606143268 Reorder the terms: -1.5 + x = 23.606143268 Solving -1.5 + x = 23.606143268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 23.606143268 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 23.606143268 + 1.5 x = 23.606143268 + 1.5 Combine like terms: 23.606143268 + 1.5 = 25.106143268 x = 25.106143268 Simplifying x = 25.106143268

Subproblem 2

x + -1.5 = -23.606143268 Simplifying x + -1.5 = -23.606143268 Reorder the terms: -1.5 + x = -23.606143268 Solving -1.5 + x = -23.606143268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -23.606143268 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -23.606143268 + 1.5 x = -23.606143268 + 1.5 Combine like terms: -23.606143268 + 1.5 = -22.106143268 x = -22.106143268 Simplifying x = -22.106143268

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.106143268, -22.106143268}

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