x^2-1=10x

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Solution for x^2-1=10x equation:


Simplifying
x2 + -1 = 10x

Reorder the terms:
-1 + x2 = 10x

Solving
-1 + x2 = 10x

Solving for variable 'x'.

Reorder the terms:
-1 + -10x + x2 = 10x + -10x

Combine like terms: 10x + -10x = 0
-1 + -10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -10x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -10x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -10x + x2 = 0 + 1
-10x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-10x + x2 = 1

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 1 + 25

Reorder the terms:
25 + -10x + x2 = 1 + 25

Combine like terms: 1 + 25 = 26
25 + -10x + x2 = 26

Factor a perfect square on the left side:
(x + -5)(x + -5) = 26

Calculate the square root of the right side: 5.099019514

Break this problem into two subproblems by setting 
(x + -5) equal to 5.099019514 and -5.099019514.

Subproblem 1

x + -5 = 5.099019514 Simplifying x + -5 = 5.099019514 Reorder the terms: -5 + x = 5.099019514 Solving -5 + x = 5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 5.099019514 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.099019514 + 5 x = 5.099019514 + 5 Combine like terms: 5.099019514 + 5 = 10.099019514 x = 10.099019514 Simplifying x = 10.099019514

Subproblem 2

x + -5 = -5.099019514 Simplifying x + -5 = -5.099019514 Reorder the terms: -5 + x = -5.099019514 Solving -5 + x = -5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -5.099019514 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.099019514 + 5 x = -5.099019514 + 5 Combine like terms: -5.099019514 + 5 = -0.099019514 x = -0.099019514 Simplifying x = -0.099019514

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.099019514, -0.099019514}

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