800=100x-0.5x^2

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Solution for 800=100x-0.5x^2 equation:


Simplifying
800 = 100x + -0.5x2

Solving
800 = 100x + -0.5x2

Solving for variable 'x'.

Reorder the terms:
800 + -100x + 0.5x2 = 100x + -100x + -0.5x2 + 0.5x2

Combine like terms: 100x + -100x = 0
800 + -100x + 0.5x2 = 0 + -0.5x2 + 0.5x2
800 + -100x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
800 + -100x + 0.5x2 = 0.0

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

Divide each side by '0.5'.
1600 + -200x + x2 = 0

Move the constant term to the right:

Add '-1600' to each side of the equation.
1600 + -200x + -1600 + x2 = 0 + -1600

Reorder the terms:
1600 + -1600 + -200x + x2 = 0 + -1600

Combine like terms: 1600 + -1600 = 0
0 + -200x + x2 = 0 + -1600
-200x + x2 = 0 + -1600

Combine like terms: 0 + -1600 = -1600
-200x + x2 = -1600

The x term is -200x.  Take half its coefficient (-100).
Square it (10000) and add it to both sides.

Add '10000' to each side of the equation.
-200x + 10000 + x2 = -1600 + 10000

Reorder the terms:
10000 + -200x + x2 = -1600 + 10000

Combine like terms: -1600 + 10000 = 8400
10000 + -200x + x2 = 8400

Factor a perfect square on the left side:
(x + -100)(x + -100) = 8400

Calculate the square root of the right side: 91.651513899

Break this problem into two subproblems by setting 
(x + -100) equal to 91.651513899 and -91.651513899.

Subproblem 1

x + -100 = 91.651513899 Simplifying x + -100 = 91.651513899 Reorder the terms: -100 + x = 91.651513899 Solving -100 + x = 91.651513899 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + x = 91.651513899 + 100 Combine like terms: -100 + 100 = 0 0 + x = 91.651513899 + 100 x = 91.651513899 + 100 Combine like terms: 91.651513899 + 100 = 191.651513899 x = 191.651513899 Simplifying x = 191.651513899

Subproblem 2

x + -100 = -91.651513899 Simplifying x + -100 = -91.651513899 Reorder the terms: -100 + x = -91.651513899 Solving -100 + x = -91.651513899 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + x = -91.651513899 + 100 Combine like terms: -100 + 100 = 0 0 + x = -91.651513899 + 100 x = -91.651513899 + 100 Combine like terms: -91.651513899 + 100 = 8.348486101 x = 8.348486101 Simplifying x = 8.348486101

Solution

The solution to the problem is based on the solutions from the subproblems. x = {191.651513899, 8.348486101}

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