-0.002*Q^2+0.5*Q=11.25

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Solution for -0.002*Q^2+0.5*Q=11.25 equation:


Simplifying
-0.002Q2 + 0.5Q = 11.25

Reorder the terms:
0.5Q + -0.002Q2 = 11.25

Solving
0.5Q + -0.002Q2 = 11.25

Solving for variable 'Q'.

Reorder the terms:
-11.25 + 0.5Q + -0.002Q2 = 11.25 + -11.25

Combine like terms: 11.25 + -11.25 = 0.00
-11.25 + 0.5Q + -0.002Q2 = 0.00

Begin completing the square.  Divide all terms by
-0.002 the coefficient of the squared term: 

Divide each side by '-0.002'.
5625 + -250Q + Q2 = 0

Move the constant term to the right:

Add '-5625' to each side of the equation.
5625 + -250Q + -5625 + Q2 = 0 + -5625

Reorder the terms:
5625 + -5625 + -250Q + Q2 = 0 + -5625

Combine like terms: 5625 + -5625 = 0
0 + -250Q + Q2 = 0 + -5625
-250Q + Q2 = 0 + -5625

Combine like terms: 0 + -5625 = -5625
-250Q + Q2 = -5625

The Q term is -250Q.  Take half its coefficient (-125).
Square it (15625) and add it to both sides.

Add '15625' to each side of the equation.
-250Q + 15625 + Q2 = -5625 + 15625

Reorder the terms:
15625 + -250Q + Q2 = -5625 + 15625

Combine like terms: -5625 + 15625 = 10000
15625 + -250Q + Q2 = 10000

Factor a perfect square on the left side:
(Q + -125)(Q + -125) = 10000

Calculate the square root of the right side: 100

Break this problem into two subproblems by setting 
(Q + -125) equal to 100 and -100.

Subproblem 1

Q + -125 = 100 Simplifying Q + -125 = 100 Reorder the terms: -125 + Q = 100 Solving -125 + Q = 100 Solving for variable 'Q'. Move all terms containing Q to the left, all other terms to the right. Add '125' to each side of the equation. -125 + 125 + Q = 100 + 125 Combine like terms: -125 + 125 = 0 0 + Q = 100 + 125 Q = 100 + 125 Combine like terms: 100 + 125 = 225 Q = 225 Simplifying Q = 225

Subproblem 2

Q + -125 = -100 Simplifying Q + -125 = -100 Reorder the terms: -125 + Q = -100 Solving -125 + Q = -100 Solving for variable 'Q'. Move all terms containing Q to the left, all other terms to the right. Add '125' to each side of the equation. -125 + 125 + Q = -100 + 125 Combine like terms: -125 + 125 = 0 0 + Q = -100 + 125 Q = -100 + 125 Combine like terms: -100 + 125 = 25 Q = 25 Simplifying Q = 25

Solution

The solution to the problem is based on the solutions from the subproblems. Q = {225, 25}

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