x(x-1)=100

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Solution for x(x-1)=100 equation:


Simplifying
x(x + -1) = 100

Reorder the terms:
x(-1 + x) = 100
(-1 * x + x * x) = 100
(-1x + x2) = 100

Solving
-1x + x2 = 100

Solving for variable 'x'.

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

Combine like terms: 100 + -100 = 0
-100 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -1x + 100 + x2 = 0 + 100

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

Combine like terms: -100 + 100 = 0
0 + -1x + x2 = 0 + 100
-1x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
-1x + x2 = 100

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 100 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 100 + 0.25

Combine like terms: 100 + 0.25 = 100.25
0.25 + -1x + x2 = 100.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 100.25

Calculate the square root of the right side: 10.012492197

Break this problem into two subproblems by setting 
(x + -0.5) equal to 10.012492197 and -10.012492197.

Subproblem 1

x + -0.5 = 10.012492197 Simplifying x + -0.5 = 10.012492197 Reorder the terms: -0.5 + x = 10.012492197 Solving -0.5 + x = 10.012492197 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 10.012492197 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 10.012492197 + 0.5 x = 10.012492197 + 0.5 Combine like terms: 10.012492197 + 0.5 = 10.512492197 x = 10.512492197 Simplifying x = 10.512492197

Subproblem 2

x + -0.5 = -10.012492197 Simplifying x + -0.5 = -10.012492197 Reorder the terms: -0.5 + x = -10.012492197 Solving -0.5 + x = -10.012492197 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -10.012492197 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -10.012492197 + 0.5 x = -10.012492197 + 0.5 Combine like terms: -10.012492197 + 0.5 = -9.512492197 x = -9.512492197 Simplifying x = -9.512492197

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.512492197, -9.512492197}

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