11500=.05x^2+15x+6500

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Solution for 11500=.05x^2+15x+6500 equation:


Simplifying
11500 = 0.05x2 + 15x + 6500

Reorder the terms:
11500 = 6500 + 15x + 0.05x2

Solving
11500 = 6500 + 15x + 0.05x2

Solving for variable 'x'.

Combine like terms: 11500 + -6500 = 5000
5000 + -15x + -0.05x2 = 6500 + 15x + 0.05x2 + -6500 + -15x + -0.05x2

Reorder the terms:
5000 + -15x + -0.05x2 = 6500 + -6500 + 15x + -15x + 0.05x2 + -0.05x2

Combine like terms: 6500 + -6500 = 0
5000 + -15x + -0.05x2 = 0 + 15x + -15x + 0.05x2 + -0.05x2
5000 + -15x + -0.05x2 = 15x + -15x + 0.05x2 + -0.05x2

Combine like terms: 15x + -15x = 0
5000 + -15x + -0.05x2 = 0 + 0.05x2 + -0.05x2
5000 + -15x + -0.05x2 = 0.05x2 + -0.05x2

Combine like terms: 0.05x2 + -0.05x2 = 0.00
5000 + -15x + -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'.
-100000 + 300x + x2 = 0

Move the constant term to the right:

Add '100000' to each side of the equation.
-100000 + 300x + 100000 + x2 = 0 + 100000

Reorder the terms:
-100000 + 100000 + 300x + x2 = 0 + 100000

Combine like terms: -100000 + 100000 = 0
0 + 300x + x2 = 0 + 100000
300x + x2 = 0 + 100000

Combine like terms: 0 + 100000 = 100000
300x + x2 = 100000

The x term is 300x.  Take half its coefficient (150).
Square it (22500) and add it to both sides.

Add '22500' to each side of the equation.
300x + 22500 + x2 = 100000 + 22500

Reorder the terms:
22500 + 300x + x2 = 100000 + 22500

Combine like terms: 100000 + 22500 = 122500
22500 + 300x + x2 = 122500

Factor a perfect square on the left side:
(x + 150)(x + 150) = 122500

Calculate the square root of the right side: 350

Break this problem into two subproblems by setting 
(x + 150) equal to 350 and -350.

Subproblem 1

x + 150 = 350 Simplifying x + 150 = 350 Reorder the terms: 150 + x = 350 Solving 150 + x = 350 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-150' to each side of the equation. 150 + -150 + x = 350 + -150 Combine like terms: 150 + -150 = 0 0 + x = 350 + -150 x = 350 + -150 Combine like terms: 350 + -150 = 200 x = 200 Simplifying x = 200

Subproblem 2

x + 150 = -350 Simplifying x + 150 = -350 Reorder the terms: 150 + x = -350 Solving 150 + x = -350 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-150' to each side of the equation. 150 + -150 + x = -350 + -150 Combine like terms: 150 + -150 = 0 0 + x = -350 + -150 x = -350 + -150 Combine like terms: -350 + -150 = -500 x = -500 Simplifying x = -500

Solution

The solution to the problem is based on the solutions from the subproblems. x = {200, -500}

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