650=11.5x-.05x^2

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Solution for 650=11.5x-.05x^2 equation:


Simplifying
650 = 11.5x + -0.05x2

Solving
650 = 11.5x + -0.05x2

Solving for variable 'x'.

Reorder the terms:
650 + -11.5x + 0.05x2 = 11.5x + -11.5x + -0.05x2 + 0.05x2

Combine like terms: 11.5x + -11.5x = 0.0
650 + -11.5x + 0.05x2 = 0.0 + -0.05x2 + 0.05x2
650 + -11.5x + 0.05x2 = -0.05x2 + 0.05x2

Combine like terms: -0.05x2 + 0.05x2 = 0.00
650 + -11.5x + 0.05x2 = 0.00

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

Divide each side by '0.05'.
13000 + -230x + x2 = 0

Move the constant term to the right:

Add '-13000' to each side of the equation.
13000 + -230x + -13000 + x2 = 0 + -13000

Reorder the terms:
13000 + -13000 + -230x + x2 = 0 + -13000

Combine like terms: 13000 + -13000 = 0
0 + -230x + x2 = 0 + -13000
-230x + x2 = 0 + -13000

Combine like terms: 0 + -13000 = -13000
-230x + x2 = -13000

The x term is -230x.  Take half its coefficient (-115).
Square it (13225) and add it to both sides.

Add '13225' to each side of the equation.
-230x + 13225 + x2 = -13000 + 13225

Reorder the terms:
13225 + -230x + x2 = -13000 + 13225

Combine like terms: -13000 + 13225 = 225
13225 + -230x + x2 = 225

Factor a perfect square on the left side:
(x + -115)(x + -115) = 225

Calculate the square root of the right side: 15

Break this problem into two subproblems by setting 
(x + -115) equal to 15 and -15.

Subproblem 1

x + -115 = 15 Simplifying x + -115 = 15 Reorder the terms: -115 + x = 15 Solving -115 + x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '115' to each side of the equation. -115 + 115 + x = 15 + 115 Combine like terms: -115 + 115 = 0 0 + x = 15 + 115 x = 15 + 115 Combine like terms: 15 + 115 = 130 x = 130 Simplifying x = 130

Subproblem 2

x + -115 = -15 Simplifying x + -115 = -15 Reorder the terms: -115 + x = -15 Solving -115 + x = -15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '115' to each side of the equation. -115 + 115 + x = -15 + 115 Combine like terms: -115 + 115 = 0 0 + x = -15 + 115 x = -15 + 115 Combine like terms: -15 + 115 = 100 x = 100 Simplifying x = 100

Solution

The solution to the problem is based on the solutions from the subproblems. x = {130, 100}

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