x^2-2x-25=0

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Solution for x^2-2x-25=0 equation:


Simplifying
x2 + -2x + -25 = 0

Reorder the terms:
-25 + -2x + x2 = 0

Solving
-25 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -2x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + -2x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -2x + x2 = 0 + 25
-2x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
-2x + x2 = 25

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 25 + 1

Reorder the terms:
1 + -2x + x2 = 25 + 1

Combine like terms: 25 + 1 = 26
1 + -2x + x2 = 26

Factor a perfect square on the left side:
(x + -1)(x + -1) = 26

Calculate the square root of the right side: 5.099019514

Break this problem into two subproblems by setting 
(x + -1) equal to 5.099019514 and -5.099019514.

Subproblem 1

x + -1 = 5.099019514 Simplifying x + -1 = 5.099019514 Reorder the terms: -1 + x = 5.099019514 Solving -1 + x = 5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 5.099019514 + 1 Combine like terms: -1 + 1 = 0 0 + x = 5.099019514 + 1 x = 5.099019514 + 1 Combine like terms: 5.099019514 + 1 = 6.099019514 x = 6.099019514 Simplifying x = 6.099019514

Subproblem 2

x + -1 = -5.099019514 Simplifying x + -1 = -5.099019514 Reorder the terms: -1 + x = -5.099019514 Solving -1 + x = -5.099019514 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -5.099019514 + 1 Combine like terms: -1 + 1 = 0 0 + x = -5.099019514 + 1 x = -5.099019514 + 1 Combine like terms: -5.099019514 + 1 = -4.099019514 x = -4.099019514 Simplifying x = -4.099019514

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.099019514, -4.099019514}

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