18000-10x-.2x^2=0

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Solution for 18000-10x-.2x^2=0 equation:


Simplifying
18000 + -10x + -0.2x2 = 0

Solving
18000 + -10x + -0.2x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.2 the coefficient of the squared term: 

Divide each side by '-0.2'.
-90000 + 50x + x2 = 0

Move the constant term to the right:

Add '90000' to each side of the equation.
-90000 + 50x + 90000 + x2 = 0 + 90000

Reorder the terms:
-90000 + 90000 + 50x + x2 = 0 + 90000

Combine like terms: -90000 + 90000 = 0
0 + 50x + x2 = 0 + 90000
50x + x2 = 0 + 90000

Combine like terms: 0 + 90000 = 90000
50x + x2 = 90000

The x term is 50x.  Take half its coefficient (25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
50x + 625 + x2 = 90000 + 625

Reorder the terms:
625 + 50x + x2 = 90000 + 625

Combine like terms: 90000 + 625 = 90625
625 + 50x + x2 = 90625

Factor a perfect square on the left side:
(x + 25)(x + 25) = 90625

Calculate the square root of the right side: 301.03986447

Break this problem into two subproblems by setting 
(x + 25) equal to 301.03986447 and -301.03986447.

Subproblem 1

x + 25 = 301.03986447 Simplifying x + 25 = 301.03986447 Reorder the terms: 25 + x = 301.03986447 Solving 25 + x = 301.03986447 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + x = 301.03986447 + -25 Combine like terms: 25 + -25 = 0 0 + x = 301.03986447 + -25 x = 301.03986447 + -25 Combine like terms: 301.03986447 + -25 = 276.03986447 x = 276.03986447 Simplifying x = 276.03986447

Subproblem 2

x + 25 = -301.03986447 Simplifying x + 25 = -301.03986447 Reorder the terms: 25 + x = -301.03986447 Solving 25 + x = -301.03986447 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + x = -301.03986447 + -25 Combine like terms: 25 + -25 = 0 0 + x = -301.03986447 + -25 x = -301.03986447 + -25 Combine like terms: -301.03986447 + -25 = -326.03986447 x = -326.03986447 Simplifying x = -326.03986447

Solution

The solution to the problem is based on the solutions from the subproblems. x = {276.03986447, -326.03986447}

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