x^2-x=102

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Solution for x^2-x=102 equation:


Simplifying
x2 + -1x = 102

Reorder the terms:
-1x + x2 = 102

Solving
-1x + x2 = 102

Solving for variable 'x'.

Reorder the terms:
-102 + -1x + x2 = 102 + -102

Combine like terms: 102 + -102 = 0
-102 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '102' to each side of the equation.
-102 + -1x + 102 + x2 = 0 + 102

Reorder the terms:
-102 + 102 + -1x + x2 = 0 + 102

Combine like terms: -102 + 102 = 0
0 + -1x + x2 = 0 + 102
-1x + x2 = 0 + 102

Combine like terms: 0 + 102 = 102
-1x + x2 = 102

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 = 102 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 102 + 0.25

Combine like terms: 102 + 0.25 = 102.25
0.25 + -1x + x2 = 102.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 102.25

Calculate the square root of the right side: 10.111874208

Break this problem into two subproblems by setting 
(x + -0.5) equal to 10.111874208 and -10.111874208.

Subproblem 1

x + -0.5 = 10.111874208 Simplifying x + -0.5 = 10.111874208 Reorder the terms: -0.5 + x = 10.111874208 Solving -0.5 + x = 10.111874208 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 = 10.111874208 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 10.111874208 + 0.5 x = 10.111874208 + 0.5 Combine like terms: 10.111874208 + 0.5 = 10.611874208 x = 10.611874208 Simplifying x = 10.611874208

Subproblem 2

x + -0.5 = -10.111874208 Simplifying x + -0.5 = -10.111874208 Reorder the terms: -0.5 + x = -10.111874208 Solving -0.5 + x = -10.111874208 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 = -10.111874208 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -10.111874208 + 0.5 x = -10.111874208 + 0.5 Combine like terms: -10.111874208 + 0.5 = -9.611874208 x = -9.611874208 Simplifying x = -9.611874208

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.611874208, -9.611874208}

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