115000=0.5x^2+15x+5000

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Solution for 115000=0.5x^2+15x+5000 equation:


Simplifying
115000 = 0.5x2 + 15x + 5000

Reorder the terms:
115000 = 5000 + 15x + 0.5x2

Solving
115000 = 5000 + 15x + 0.5x2

Solving for variable 'x'.

Combine like terms: 115000 + -5000 = 110000
110000 + -15x + -0.5x2 = 5000 + 15x + 0.5x2 + -5000 + -15x + -0.5x2

Reorder the terms:
110000 + -15x + -0.5x2 = 5000 + -5000 + 15x + -15x + 0.5x2 + -0.5x2

Combine like terms: 5000 + -5000 = 0
110000 + -15x + -0.5x2 = 0 + 15x + -15x + 0.5x2 + -0.5x2
110000 + -15x + -0.5x2 = 15x + -15x + 0.5x2 + -0.5x2

Combine like terms: 15x + -15x = 0
110000 + -15x + -0.5x2 = 0 + 0.5x2 + -0.5x2
110000 + -15x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
110000 + -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'.
-220000 + 30x + x2 = 0

Move the constant term to the right:

Add '220000' to each side of the equation.
-220000 + 30x + 220000 + x2 = 0 + 220000

Reorder the terms:
-220000 + 220000 + 30x + x2 = 0 + 220000

Combine like terms: -220000 + 220000 = 0
0 + 30x + x2 = 0 + 220000
30x + x2 = 0 + 220000

Combine like terms: 0 + 220000 = 220000
30x + x2 = 220000

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 = 220000 + 225

Reorder the terms:
225 + 30x + x2 = 220000 + 225

Combine like terms: 220000 + 225 = 220225
225 + 30x + x2 = 220225

Factor a perfect square on the left side:
(x + 15)(x + 15) = 220225

Calculate the square root of the right side: 469.281365494

Break this problem into two subproblems by setting 
(x + 15) equal to 469.281365494 and -469.281365494.

Subproblem 1

x + 15 = 469.281365494 Simplifying x + 15 = 469.281365494 Reorder the terms: 15 + x = 469.281365494 Solving 15 + x = 469.281365494 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 = 469.281365494 + -15 Combine like terms: 15 + -15 = 0 0 + x = 469.281365494 + -15 x = 469.281365494 + -15 Combine like terms: 469.281365494 + -15 = 454.281365494 x = 454.281365494 Simplifying x = 454.281365494

Subproblem 2

x + 15 = -469.281365494 Simplifying x + 15 = -469.281365494 Reorder the terms: 15 + x = -469.281365494 Solving 15 + x = -469.281365494 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 = -469.281365494 + -15 Combine like terms: 15 + -15 = 0 0 + x = -469.281365494 + -15 x = -469.281365494 + -15 Combine like terms: -469.281365494 + -15 = -484.281365494 x = -484.281365494 Simplifying x = -484.281365494

Solution

The solution to the problem is based on the solutions from the subproblems. x = {454.281365494, -484.281365494}

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