56-0.02Q=20-0.14Q+0.0003Q^2

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Solution for 56-0.02Q=20-0.14Q+0.0003Q^2 equation:


Simplifying
56 + -0.02Q = 20 + -0.14Q + 0.0003Q2

Solving
56 + -0.02Q = 20 + -0.14Q + 0.0003Q2

Solving for variable 'Q'.

Reorder the terms:
56 + -20 + -0.02Q + 0.14Q + -0.0003Q2 = 20 + -0.14Q + 0.0003Q2 + -20 + 0.14Q + -0.0003Q2

Combine like terms: 56 + -20 = 36
36 + -0.02Q + 0.14Q + -0.0003Q2 = 20 + -0.14Q + 0.0003Q2 + -20 + 0.14Q + -0.0003Q2

Combine like terms: -0.02Q + 0.14Q = 0.12Q
36 + 0.12Q + -0.0003Q2 = 20 + -0.14Q + 0.0003Q2 + -20 + 0.14Q + -0.0003Q2

Reorder the terms:
36 + 0.12Q + -0.0003Q2 = 20 + -20 + -0.14Q + 0.14Q + 0.0003Q2 + -0.0003Q2

Combine like terms: 20 + -20 = 0
36 + 0.12Q + -0.0003Q2 = 0 + -0.14Q + 0.14Q + 0.0003Q2 + -0.0003Q2
36 + 0.12Q + -0.0003Q2 = -0.14Q + 0.14Q + 0.0003Q2 + -0.0003Q2

Combine like terms: -0.14Q + 0.14Q = 0.00
36 + 0.12Q + -0.0003Q2 = 0.00 + 0.0003Q2 + -0.0003Q2
36 + 0.12Q + -0.0003Q2 = 0.0003Q2 + -0.0003Q2

Combine like terms: 0.0003Q2 + -0.0003Q2 = 0.0000
36 + 0.12Q + -0.0003Q2 = 0.0000

Begin completing the square.  Divide all terms by
-0.0003 the coefficient of the squared term: 

Divide each side by '-0.0003'.
-120000 + -400Q + Q2 = 0

Move the constant term to the right:

Add '120000' to each side of the equation.
-120000 + -400Q + 120000 + Q2 = 0 + 120000

Reorder the terms:
-120000 + 120000 + -400Q + Q2 = 0 + 120000

Combine like terms: -120000 + 120000 = 0
0 + -400Q + Q2 = 0 + 120000
-400Q + Q2 = 0 + 120000

Combine like terms: 0 + 120000 = 120000
-400Q + Q2 = 120000

The Q term is -400Q.  Take half its coefficient (-200).
Square it (40000) and add it to both sides.

Add '40000' to each side of the equation.
-400Q + 40000 + Q2 = 120000 + 40000

Reorder the terms:
40000 + -400Q + Q2 = 120000 + 40000

Combine like terms: 120000 + 40000 = 160000
40000 + -400Q + Q2 = 160000

Factor a perfect square on the left side:
(Q + -200)(Q + -200) = 160000

Calculate the square root of the right side: 400

Break this problem into two subproblems by setting 
(Q + -200) equal to 400 and -400.

Subproblem 1

Q + -200 = 400 Simplifying Q + -200 = 400 Reorder the terms: -200 + Q = 400 Solving -200 + Q = 400 Solving for variable 'Q'. Move all terms containing Q to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + Q = 400 + 200 Combine like terms: -200 + 200 = 0 0 + Q = 400 + 200 Q = 400 + 200 Combine like terms: 400 + 200 = 600 Q = 600 Simplifying Q = 600

Subproblem 2

Q + -200 = -400 Simplifying Q + -200 = -400 Reorder the terms: -200 + Q = -400 Solving -200 + Q = -400 Solving for variable 'Q'. Move all terms containing Q to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + Q = -400 + 200 Combine like terms: -200 + 200 = 0 0 + Q = -400 + 200 Q = -400 + 200 Combine like terms: -400 + 200 = -200 Q = -200 Simplifying Q = -200

Solution

The solution to the problem is based on the solutions from the subproblems. Q = {600, -200}

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