450-x^2-2x=0

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Solution for 450-x^2-2x=0 equation:


Simplifying
450 + -1x2 + -2x = 0

Reorder the terms:
450 + -2x + -1x2 = 0

Solving
450 + -2x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
-450 + 2x + x2 = 0

Move the constant term to the right:

Add '450' to each side of the equation.
-450 + 2x + 450 + x2 = 0 + 450

Reorder the terms:
-450 + 450 + 2x + x2 = 0 + 450

Combine like terms: -450 + 450 = 0
0 + 2x + x2 = 0 + 450
2x + x2 = 0 + 450

Combine like terms: 0 + 450 = 450
2x + x2 = 450

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 450 + 1

Reorder the terms:
1 + 2x + x2 = 450 + 1

Combine like terms: 450 + 1 = 451
1 + 2x + x2 = 451

Factor a perfect square on the left side:
(x + 1)(x + 1) = 451

Calculate the square root of the right side: 21.236760582

Break this problem into two subproblems by setting 
(x + 1) equal to 21.236760582 and -21.236760582.

Subproblem 1

x + 1 = 21.236760582 Simplifying x + 1 = 21.236760582 Reorder the terms: 1 + x = 21.236760582 Solving 1 + x = 21.236760582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 21.236760582 + -1 Combine like terms: 1 + -1 = 0 0 + x = 21.236760582 + -1 x = 21.236760582 + -1 Combine like terms: 21.236760582 + -1 = 20.236760582 x = 20.236760582 Simplifying x = 20.236760582

Subproblem 2

x + 1 = -21.236760582 Simplifying x + 1 = -21.236760582 Reorder the terms: 1 + x = -21.236760582 Solving 1 + x = -21.236760582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -21.236760582 + -1 Combine like terms: 1 + -1 = 0 0 + x = -21.236760582 + -1 x = -21.236760582 + -1 Combine like terms: -21.236760582 + -1 = -22.236760582 x = -22.236760582 Simplifying x = -22.236760582

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.236760582, -22.236760582}

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