800-x^2-x=0

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Solution for 800-x^2-x=0 equation:


Simplifying
800 + -1x2 + -1x = 0

Reorder the terms:
800 + -1x + -1x2 = 0

Solving
800 + -1x + -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'.
-800 + x + x2 = 0

Move the constant term to the right:

Add '800' to each side of the equation.
-800 + x + 800 + x2 = 0 + 800

Reorder the terms:
-800 + 800 + x + x2 = 0 + 800

Combine like terms: -800 + 800 = 0
0 + x + x2 = 0 + 800
x + x2 = 0 + 800

Combine like terms: 0 + 800 = 800
x + x2 = 800

The x term is x.  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.
 + 0.25 + x2 = 800 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 800 + 0.25

Combine like terms: 800 + 0.25 = 800.25
1.25 + x2 = 800.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 800.25

Calculate the square root of the right side: 28.28869032

Break this problem into two subproblems by setting 
(x + 0.5) equal to 28.28869032 and -28.28869032.

Subproblem 1

x + 0.5 = 28.28869032 Simplifying x + 0.5 = 28.28869032 Reorder the terms: 0.5 + x = 28.28869032 Solving 0.5 + x = 28.28869032 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 = 28.28869032 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 28.28869032 + -0.5 x = 28.28869032 + -0.5 Combine like terms: 28.28869032 + -0.5 = 27.78869032 x = 27.78869032 Simplifying x = 27.78869032

Subproblem 2

x + 0.5 = -28.28869032 Simplifying x + 0.5 = -28.28869032 Reorder the terms: 0.5 + x = -28.28869032 Solving 0.5 + x = -28.28869032 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 = -28.28869032 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -28.28869032 + -0.5 x = -28.28869032 + -0.5 Combine like terms: -28.28869032 + -0.5 = -28.78869032 x = -28.78869032 Simplifying x = -28.78869032

Solution

The solution to the problem is based on the solutions from the subproblems. x = {27.78869032, -28.78869032}

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