0=400-5x+0.125x*0.125x

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Solution for 0=400-5x+0.125x*0.125x equation:


Simplifying
0 = 400 + -5x + 0.125x * 0.125x

Reorder the terms for easier multiplication:
0 = 400 + -5x + 0.125 * 0.125x * x

Multiply 0.125 * 0.125
0 = 400 + -5x + 0.015625x * x

Multiply x * x
0 = 400 + -5x + 0.015625x2

Solving
0 = 400 + -5x + 0.015625x2

Solving for variable 'x'.

Combine like terms: 0 + -400 = -400
-400 + 5x + -0.015625x2 = 400 + -5x + 0.015625x2 + -400 + 5x + -0.015625x2

Reorder the terms:
-400 + 5x + -0.015625x2 = 400 + -400 + -5x + 5x + 0.015625x2 + -0.015625x2

Combine like terms: 400 + -400 = 0
-400 + 5x + -0.015625x2 = 0 + -5x + 5x + 0.015625x2 + -0.015625x2
-400 + 5x + -0.015625x2 = -5x + 5x + 0.015625x2 + -0.015625x2

Combine like terms: -5x + 5x = 0
-400 + 5x + -0.015625x2 = 0 + 0.015625x2 + -0.015625x2
-400 + 5x + -0.015625x2 = 0.015625x2 + -0.015625x2

Combine like terms: 0.015625x2 + -0.015625x2 = 0.000000
-400 + 5x + -0.015625x2 = 0.000000

Begin completing the square.  Divide all terms by
-0.015625 the coefficient of the squared term: 

Divide each side by '-0.015625'.
25600 + -320x + x2 = 0

Move the constant term to the right:

Add '-25600' to each side of the equation.
25600 + -320x + -25600 + x2 = 0 + -25600

Reorder the terms:
25600 + -25600 + -320x + x2 = 0 + -25600

Combine like terms: 25600 + -25600 = 0
0 + -320x + x2 = 0 + -25600
-320x + x2 = 0 + -25600

Combine like terms: 0 + -25600 = -25600
-320x + x2 = -25600

The x term is -320x.  Take half its coefficient (-160).
Square it (25600) and add it to both sides.

Add '25600' to each side of the equation.
-320x + 25600 + x2 = -25600 + 25600

Reorder the terms:
25600 + -320x + x2 = -25600 + 25600

Combine like terms: -25600 + 25600 = 0
25600 + -320x + x2 = 0

Factor a perfect square on the left side:
(x + -160)(x + -160) = 0

Calculate the square root of the right side: 0

Break this problem into two subproblems by setting 
(x + -160) equal to 0 and 0.

Subproblem 1

x + -160 = 0 Simplifying x + -160 = 0 Reorder the terms: -160 + x = 0 Solving -160 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '160' to each side of the equation. -160 + 160 + x = 0 + 160 Combine like terms: -160 + 160 = 0 0 + x = 0 + 160 x = 0 + 160 Combine like terms: 0 + 160 = 160 x = 160 Simplifying x = 160

Subproblem 2

x + -160 = 0 Simplifying x + -160 = 0 Reorder the terms: -160 + x = 0 Solving -160 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '160' to each side of the equation. -160 + 160 + x = 0 + 160 Combine like terms: -160 + 160 = 0 0 + x = 0 + 160 x = 0 + 160 Combine like terms: 0 + 160 = 160 x = 160 Simplifying x = 160

Solution

The solution to the problem is based on the solutions from the subproblems. x = {160, 160}

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