200=6x-0.04x^2

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Solution for 200=6x-0.04x^2 equation:


Simplifying
200 = 6x + -0.04x2

Solving
200 = 6x + -0.04x2

Solving for variable 'x'.

Reorder the terms:
200 + -6x + 0.04x2 = 6x + -6x + -0.04x2 + 0.04x2

Combine like terms: 6x + -6x = 0
200 + -6x + 0.04x2 = 0 + -0.04x2 + 0.04x2
200 + -6x + 0.04x2 = -0.04x2 + 0.04x2

Combine like terms: -0.04x2 + 0.04x2 = 0.00
200 + -6x + 0.04x2 = 0.00

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

Divide each side by '0.04'.
5000 + -150x + x2 = 0

Move the constant term to the right:

Add '-5000' to each side of the equation.
5000 + -150x + -5000 + x2 = 0 + -5000

Reorder the terms:
5000 + -5000 + -150x + x2 = 0 + -5000

Combine like terms: 5000 + -5000 = 0
0 + -150x + x2 = 0 + -5000
-150x + x2 = 0 + -5000

Combine like terms: 0 + -5000 = -5000
-150x + x2 = -5000

The x term is -150x.  Take half its coefficient (-75).
Square it (5625) and add it to both sides.

Add '5625' to each side of the equation.
-150x + 5625 + x2 = -5000 + 5625

Reorder the terms:
5625 + -150x + x2 = -5000 + 5625

Combine like terms: -5000 + 5625 = 625
5625 + -150x + x2 = 625

Factor a perfect square on the left side:
(x + -75)(x + -75) = 625

Calculate the square root of the right side: 25

Break this problem into two subproblems by setting 
(x + -75) equal to 25 and -25.

Subproblem 1

x + -75 = 25 Simplifying x + -75 = 25 Reorder the terms: -75 + x = 25 Solving -75 + x = 25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '75' to each side of the equation. -75 + 75 + x = 25 + 75 Combine like terms: -75 + 75 = 0 0 + x = 25 + 75 x = 25 + 75 Combine like terms: 25 + 75 = 100 x = 100 Simplifying x = 100

Subproblem 2

x + -75 = -25 Simplifying x + -75 = -25 Reorder the terms: -75 + x = -25 Solving -75 + x = -25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '75' to each side of the equation. -75 + 75 + x = -25 + 75 Combine like terms: -75 + 75 = 0 0 + x = -25 + 75 x = -25 + 75 Combine like terms: -25 + 75 = 50 x = 50 Simplifying x = 50

Solution

The solution to the problem is based on the solutions from the subproblems. x = {100, 50}

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