100-10x+0.1x^2=500

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Solution for 100-10x+0.1x^2=500 equation:


Simplifying
100 + -10x + 0.1x2 = 500

Solving
100 + -10x + 0.1x2 = 500

Solving for variable 'x'.

Reorder the terms:
100 + -500 + -10x + 0.1x2 = 500 + -500

Combine like terms: 100 + -500 = -400
-400 + -10x + 0.1x2 = 500 + -500

Combine like terms: 500 + -500 = 0
-400 + -10x + 0.1x2 = 0

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

Divide each side by '0.1'.
-4000 + -100x + x2 = 0

Move the constant term to the right:

Add '4000' to each side of the equation.
-4000 + -100x + 4000 + x2 = 0 + 4000

Reorder the terms:
-4000 + 4000 + -100x + x2 = 0 + 4000

Combine like terms: -4000 + 4000 = 0
0 + -100x + x2 = 0 + 4000
-100x + x2 = 0 + 4000

Combine like terms: 0 + 4000 = 4000
-100x + x2 = 4000

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 = 4000 + 2500

Reorder the terms:
2500 + -100x + x2 = 4000 + 2500

Combine like terms: 4000 + 2500 = 6500
2500 + -100x + x2 = 6500

Factor a perfect square on the left side:
(x + -50)(x + -50) = 6500

Calculate the square root of the right side: 80.622577483

Break this problem into two subproblems by setting 
(x + -50) equal to 80.622577483 and -80.622577483.

Subproblem 1

x + -50 = 80.622577483 Simplifying x + -50 = 80.622577483 Reorder the terms: -50 + x = 80.622577483 Solving -50 + x = 80.622577483 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 = 80.622577483 + 50 Combine like terms: -50 + 50 = 0 0 + x = 80.622577483 + 50 x = 80.622577483 + 50 Combine like terms: 80.622577483 + 50 = 130.622577483 x = 130.622577483 Simplifying x = 130.622577483

Subproblem 2

x + -50 = -80.622577483 Simplifying x + -50 = -80.622577483 Reorder the terms: -50 + x = -80.622577483 Solving -50 + x = -80.622577483 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 = -80.622577483 + 50 Combine like terms: -50 + 50 = 0 0 + x = -80.622577483 + 50 x = -80.622577483 + 50 Combine like terms: -80.622577483 + 50 = -30.622577483 x = -30.622577483 Simplifying x = -30.622577483

Solution

The solution to the problem is based on the solutions from the subproblems. x = {130.622577483, -30.622577483}

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