900-20x-x^2=0

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Solution for 900-20x-x^2=0 equation:


Simplifying
900 + -20x + -1x2 = 0

Solving
900 + -20x + -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'.
-900 + 20x + x2 = 0

Move the constant term to the right:

Add '900' to each side of the equation.
-900 + 20x + 900 + x2 = 0 + 900

Reorder the terms:
-900 + 900 + 20x + x2 = 0 + 900

Combine like terms: -900 + 900 = 0
0 + 20x + x2 = 0 + 900
20x + x2 = 0 + 900

Combine like terms: 0 + 900 = 900
20x + x2 = 900

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 900 + 100

Reorder the terms:
100 + 20x + x2 = 900 + 100

Combine like terms: 900 + 100 = 1000
100 + 20x + x2 = 1000

Factor a perfect square on the left side:
(x + 10)(x + 10) = 1000

Calculate the square root of the right side: 31.622776602

Break this problem into two subproblems by setting 
(x + 10) equal to 31.622776602 and -31.622776602.

Subproblem 1

x + 10 = 31.622776602 Simplifying x + 10 = 31.622776602 Reorder the terms: 10 + x = 31.622776602 Solving 10 + x = 31.622776602 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 31.622776602 + -10 Combine like terms: 10 + -10 = 0 0 + x = 31.622776602 + -10 x = 31.622776602 + -10 Combine like terms: 31.622776602 + -10 = 21.622776602 x = 21.622776602 Simplifying x = 21.622776602

Subproblem 2

x + 10 = -31.622776602 Simplifying x + 10 = -31.622776602 Reorder the terms: 10 + x = -31.622776602 Solving 10 + x = -31.622776602 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -31.622776602 + -10 Combine like terms: 10 + -10 = 0 0 + x = -31.622776602 + -10 x = -31.622776602 + -10 Combine like terms: -31.622776602 + -10 = -41.622776602 x = -41.622776602 Simplifying x = -41.622776602

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.622776602, -41.622776602}

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