0=x^2-45x-621

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Solution for 0=x^2-45x-621 equation:


Simplifying
0 = x2 + -45x + -621

Reorder the terms:
0 = -621 + -45x + x2

Solving
0 = -621 + -45x + x2

Solving for variable 'x'.

Combine like terms: 0 + 621 = 621
621 + 45x + -1x2 = -621 + -45x + x2 + 621 + 45x + -1x2

Reorder the terms:
621 + 45x + -1x2 = -621 + 621 + -45x + 45x + x2 + -1x2

Combine like terms: -621 + 621 = 0
621 + 45x + -1x2 = 0 + -45x + 45x + x2 + -1x2
621 + 45x + -1x2 = -45x + 45x + x2 + -1x2

Combine like terms: -45x + 45x = 0
621 + 45x + -1x2 = 0 + x2 + -1x2
621 + 45x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
621 + 45x + -1x2 = 0

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

Divide each side by '-1'.
-621 + -45x + x2 = 0

Move the constant term to the right:

Add '621' to each side of the equation.
-621 + -45x + 621 + x2 = 0 + 621

Reorder the terms:
-621 + 621 + -45x + x2 = 0 + 621

Combine like terms: -621 + 621 = 0
0 + -45x + x2 = 0 + 621
-45x + x2 = 0 + 621

Combine like terms: 0 + 621 = 621
-45x + x2 = 621

The x term is -45x.  Take half its coefficient (-22.5).
Square it (506.25) and add it to both sides.

Add '506.25' to each side of the equation.
-45x + 506.25 + x2 = 621 + 506.25

Reorder the terms:
506.25 + -45x + x2 = 621 + 506.25

Combine like terms: 621 + 506.25 = 1127.25
506.25 + -45x + x2 = 1127.25

Factor a perfect square on the left side:
(x + -22.5)(x + -22.5) = 1127.25

Calculate the square root of the right side: 33.574543928

Break this problem into two subproblems by setting 
(x + -22.5) equal to 33.574543928 and -33.574543928.

Subproblem 1

x + -22.5 = 33.574543928 Simplifying x + -22.5 = 33.574543928 Reorder the terms: -22.5 + x = 33.574543928 Solving -22.5 + x = 33.574543928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22.5' to each side of the equation. -22.5 + 22.5 + x = 33.574543928 + 22.5 Combine like terms: -22.5 + 22.5 = 0.0 0.0 + x = 33.574543928 + 22.5 x = 33.574543928 + 22.5 Combine like terms: 33.574543928 + 22.5 = 56.074543928 x = 56.074543928 Simplifying x = 56.074543928

Subproblem 2

x + -22.5 = -33.574543928 Simplifying x + -22.5 = -33.574543928 Reorder the terms: -22.5 + x = -33.574543928 Solving -22.5 + x = -33.574543928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22.5' to each side of the equation. -22.5 + 22.5 + x = -33.574543928 + 22.5 Combine like terms: -22.5 + 22.5 = 0.0 0.0 + x = -33.574543928 + 22.5 x = -33.574543928 + 22.5 Combine like terms: -33.574543928 + 22.5 = -11.074543928 x = -11.074543928 Simplifying x = -11.074543928

Solution

The solution to the problem is based on the solutions from the subproblems. x = {56.074543928, -11.074543928}

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