800=9x-.01x^2

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Solution for 800=9x-.01x^2 equation:


Simplifying
800 = 9x + -0.01x2

Solving
800 = 9x + -0.01x2

Solving for variable 'x'.

Reorder the terms:
800 + -9x + 0.01x2 = 9x + -9x + -0.01x2 + 0.01x2

Combine like terms: 9x + -9x = 0
800 + -9x + 0.01x2 = 0 + -0.01x2 + 0.01x2
800 + -9x + 0.01x2 = -0.01x2 + 0.01x2

Combine like terms: -0.01x2 + 0.01x2 = 0.00
800 + -9x + 0.01x2 = 0.00

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

Divide each side by '0.01'.
80000 + -900x + x2 = 0

Move the constant term to the right:

Add '-80000' to each side of the equation.
80000 + -900x + -80000 + x2 = 0 + -80000

Reorder the terms:
80000 + -80000 + -900x + x2 = 0 + -80000

Combine like terms: 80000 + -80000 = 0
0 + -900x + x2 = 0 + -80000
-900x + x2 = 0 + -80000

Combine like terms: 0 + -80000 = -80000
-900x + x2 = -80000

The x term is -900x.  Take half its coefficient (-450).
Square it (202500) and add it to both sides.

Add '202500' to each side of the equation.
-900x + 202500 + x2 = -80000 + 202500

Reorder the terms:
202500 + -900x + x2 = -80000 + 202500

Combine like terms: -80000 + 202500 = 122500
202500 + -900x + x2 = 122500

Factor a perfect square on the left side:
(x + -450)(x + -450) = 122500

Calculate the square root of the right side: 350

Break this problem into two subproblems by setting 
(x + -450) equal to 350 and -350.

Subproblem 1

x + -450 = 350 Simplifying x + -450 = 350 Reorder the terms: -450 + x = 350 Solving -450 + x = 350 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '450' to each side of the equation. -450 + 450 + x = 350 + 450 Combine like terms: -450 + 450 = 0 0 + x = 350 + 450 x = 350 + 450 Combine like terms: 350 + 450 = 800 x = 800 Simplifying x = 800

Subproblem 2

x + -450 = -350 Simplifying x + -450 = -350 Reorder the terms: -450 + x = -350 Solving -450 + x = -350 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '450' to each side of the equation. -450 + 450 + x = -350 + 450 Combine like terms: -450 + 450 = 0 0 + x = -350 + 450 x = -350 + 450 Combine like terms: -350 + 450 = 100 x = 100 Simplifying x = 100

Solution

The solution to the problem is based on the solutions from the subproblems. x = {800, 100}

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