x(100-x)+1600=0

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Solution for x(100-x)+1600=0 equation:


Simplifying
x(100 + -1x) + 1600 = 0
(100 * x + -1x * x) + 1600 = 0
(100x + -1x2) + 1600 = 0

Reorder the terms:
1600 + 100x + -1x2 = 0

Solving
1600 + 100x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1600 + -100x + x2 = 0

Move the constant term to the right:

Add '1600' to each side of the equation.
-1600 + -100x + 1600 + x2 = 0 + 1600

Reorder the terms:
-1600 + 1600 + -100x + x2 = 0 + 1600

Combine like terms: -1600 + 1600 = 0
0 + -100x + x2 = 0 + 1600
-100x + x2 = 0 + 1600

Combine like terms: 0 + 1600 = 1600
-100x + x2 = 1600

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 = 1600 + 2500

Reorder the terms:
2500 + -100x + x2 = 1600 + 2500

Combine like terms: 1600 + 2500 = 4100
2500 + -100x + x2 = 4100

Factor a perfect square on the left side:
(x + -50)(x + -50) = 4100

Calculate the square root of the right side: 64.031242374

Break this problem into two subproblems by setting 
(x + -50) equal to 64.031242374 and -64.031242374.

Subproblem 1

x + -50 = 64.031242374 Simplifying x + -50 = 64.031242374 Reorder the terms: -50 + x = 64.031242374 Solving -50 + x = 64.031242374 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 = 64.031242374 + 50 Combine like terms: -50 + 50 = 0 0 + x = 64.031242374 + 50 x = 64.031242374 + 50 Combine like terms: 64.031242374 + 50 = 114.031242374 x = 114.031242374 Simplifying x = 114.031242374

Subproblem 2

x + -50 = -64.031242374 Simplifying x + -50 = -64.031242374 Reorder the terms: -50 + x = -64.031242374 Solving -50 + x = -64.031242374 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 = -64.031242374 + 50 Combine like terms: -50 + 50 = 0 0 + x = -64.031242374 + 50 x = -64.031242374 + 50 Combine like terms: -64.031242374 + 50 = -14.031242374 x = -14.031242374 Simplifying x = -14.031242374

Solution

The solution to the problem is based on the solutions from the subproblems. x = {114.031242374, -14.031242374}

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