18=500x-5x^2

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Solution for 18=500x-5x^2 equation:


Simplifying
18 = 500x + -5x2

Solving
18 = 500x + -5x2

Solving for variable 'x'.

Reorder the terms:
18 + -500x + 5x2 = 500x + -500x + -5x2 + 5x2

Combine like terms: 500x + -500x = 0
18 + -500x + 5x2 = 0 + -5x2 + 5x2
18 + -500x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
18 + -500x + 5x2 = 0

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

Divide each side by '5'.
3.6 + -100x + x2 = 0

Move the constant term to the right:

Add '-3.6' to each side of the equation.
3.6 + -100x + -3.6 + x2 = 0 + -3.6

Reorder the terms:
3.6 + -3.6 + -100x + x2 = 0 + -3.6

Combine like terms: 3.6 + -3.6 = 0.0
0.0 + -100x + x2 = 0 + -3.6
-100x + x2 = 0 + -3.6

Combine like terms: 0 + -3.6 = -3.6
-100x + x2 = -3.6

The x term is -100x.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100x + 2500 + x2 = -3.6 + 2500

Reorder the terms:
2500 + -100x + x2 = -3.6 + 2500

Combine like terms: -3.6 + 2500 = 2496.4
2500 + -100x + x2 = 2496.4

Factor a perfect square on the left side:
(x + -50)(x + -50) = 2496.4

Calculate the square root of the right side: 49.963987031

Break this problem into two subproblems by setting 
(x + -50) equal to 49.963987031 and -49.963987031.

Subproblem 1

x + -50 = 49.963987031 Simplifying x + -50 = 49.963987031 Reorder the terms: -50 + x = 49.963987031 Solving -50 + x = 49.963987031 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = 49.963987031 + 50 Combine like terms: -50 + 50 = 0 0 + x = 49.963987031 + 50 x = 49.963987031 + 50 Combine like terms: 49.963987031 + 50 = 99.963987031 x = 99.963987031 Simplifying x = 99.963987031

Subproblem 2

x + -50 = -49.963987031 Simplifying x + -50 = -49.963987031 Reorder the terms: -50 + x = -49.963987031 Solving -50 + x = -49.963987031 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = -49.963987031 + 50 Combine like terms: -50 + 50 = 0 0 + x = -49.963987031 + 50 x = -49.963987031 + 50 Combine like terms: -49.963987031 + 50 = 0.036012969 x = 0.036012969 Simplifying x = 0.036012969

Solution

The solution to the problem is based on the solutions from the subproblems. x = {99.963987031, 0.036012969}

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