11500=0.5x^2+15x+5000

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Solution for 11500=0.5x^2+15x+5000 equation:


Simplifying
11500 = 0.5x2 + 15x + 5000

Reorder the terms:
11500 = 5000 + 15x + 0.5x2

Solving
11500 = 5000 + 15x + 0.5x2

Solving for variable 'x'.

Combine like terms: 11500 + -5000 = 6500
6500 + -15x + -0.5x2 = 5000 + 15x + 0.5x2 + -5000 + -15x + -0.5x2

Reorder the terms:
6500 + -15x + -0.5x2 = 5000 + -5000 + 15x + -15x + 0.5x2 + -0.5x2

Combine like terms: 5000 + -5000 = 0
6500 + -15x + -0.5x2 = 0 + 15x + -15x + 0.5x2 + -0.5x2
6500 + -15x + -0.5x2 = 15x + -15x + 0.5x2 + -0.5x2

Combine like terms: 15x + -15x = 0
6500 + -15x + -0.5x2 = 0 + 0.5x2 + -0.5x2
6500 + -15x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
6500 + -15x + -0.5x2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-13000 + 30x + x2 = 0

Move the constant term to the right:

Add '13000' to each side of the equation.
-13000 + 30x + 13000 + x2 = 0 + 13000

Reorder the terms:
-13000 + 13000 + 30x + x2 = 0 + 13000

Combine like terms: -13000 + 13000 = 0
0 + 30x + x2 = 0 + 13000
30x + x2 = 0 + 13000

Combine like terms: 0 + 13000 = 13000
30x + x2 = 13000

The x term is 30x.  Take half its coefficient (15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
30x + 225 + x2 = 13000 + 225

Reorder the terms:
225 + 30x + x2 = 13000 + 225

Combine like terms: 13000 + 225 = 13225
225 + 30x + x2 = 13225

Factor a perfect square on the left side:
(x + 15)(x + 15) = 13225

Calculate the square root of the right side: 115

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

Subproblem 1

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

Subproblem 2

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

Solution

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

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