1600=12x-.02x^2

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Solution for 1600=12x-.02x^2 equation:


Simplifying
1600 = 12x + -0.02x2

Solving
1600 = 12x + -0.02x2

Solving for variable 'x'.

Reorder the terms:
1600 + -12x + 0.02x2 = 12x + -12x + -0.02x2 + 0.02x2

Combine like terms: 12x + -12x = 0
1600 + -12x + 0.02x2 = 0 + -0.02x2 + 0.02x2
1600 + -12x + 0.02x2 = -0.02x2 + 0.02x2

Combine like terms: -0.02x2 + 0.02x2 = 0.00
1600 + -12x + 0.02x2 = 0.00

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

Divide each side by '0.02'.
80000 + -600x + x2 = 0

Move the constant term to the right:

Add '-80000' to each side of the equation.
80000 + -600x + -80000 + x2 = 0 + -80000

Reorder the terms:
80000 + -80000 + -600x + x2 = 0 + -80000

Combine like terms: 80000 + -80000 = 0
0 + -600x + x2 = 0 + -80000
-600x + x2 = 0 + -80000

Combine like terms: 0 + -80000 = -80000
-600x + x2 = -80000

The x term is -600x.  Take half its coefficient (-300).
Square it (90000) and add it to both sides.

Add '90000' to each side of the equation.
-600x + 90000 + x2 = -80000 + 90000

Reorder the terms:
90000 + -600x + x2 = -80000 + 90000

Combine like terms: -80000 + 90000 = 10000
90000 + -600x + x2 = 10000

Factor a perfect square on the left side:
(x + -300)(x + -300) = 10000

Calculate the square root of the right side: 100

Break this problem into two subproblems by setting 
(x + -300) equal to 100 and -100.

Subproblem 1

x + -300 = 100 Simplifying x + -300 = 100 Reorder the terms: -300 + x = 100 Solving -300 + x = 100 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '300' to each side of the equation. -300 + 300 + x = 100 + 300 Combine like terms: -300 + 300 = 0 0 + x = 100 + 300 x = 100 + 300 Combine like terms: 100 + 300 = 400 x = 400 Simplifying x = 400

Subproblem 2

x + -300 = -100 Simplifying x + -300 = -100 Reorder the terms: -300 + x = -100 Solving -300 + x = -100 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '300' to each side of the equation. -300 + 300 + x = -100 + 300 Combine like terms: -300 + 300 = 0 0 + x = -100 + 300 x = -100 + 300 Combine like terms: -100 + 300 = 200 x = 200 Simplifying x = 200

Solution

The solution to the problem is based on the solutions from the subproblems. x = {400, 200}

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