x^2-2x-8=25

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Solution for x^2-2x-8=25 equation:


Simplifying
x2 + -2x + -8 = 25

Reorder the terms:
-8 + -2x + x2 = 25

Solving
-8 + -2x + x2 = 25

Solving for variable 'x'.

Reorder the terms:
-8 + -25 + -2x + x2 = 25 + -25

Combine like terms: -8 + -25 = -33
-33 + -2x + x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-33 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '33' to each side of the equation.
-33 + -2x + 33 + x2 = 0 + 33

Reorder the terms:
-33 + 33 + -2x + x2 = 0 + 33

Combine like terms: -33 + 33 = 0
0 + -2x + x2 = 0 + 33
-2x + x2 = 0 + 33

Combine like terms: 0 + 33 = 33
-2x + x2 = 33

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 = 33 + 1

Reorder the terms:
1 + -2x + x2 = 33 + 1

Combine like terms: 33 + 1 = 34
1 + -2x + x2 = 34

Factor a perfect square on the left side:
(x + -1)(x + -1) = 34

Calculate the square root of the right side: 5.830951895

Break this problem into two subproblems by setting 
(x + -1) equal to 5.830951895 and -5.830951895.

Subproblem 1

x + -1 = 5.830951895 Simplifying x + -1 = 5.830951895 Reorder the terms: -1 + x = 5.830951895 Solving -1 + x = 5.830951895 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 = 5.830951895 + 1 Combine like terms: -1 + 1 = 0 0 + x = 5.830951895 + 1 x = 5.830951895 + 1 Combine like terms: 5.830951895 + 1 = 6.830951895 x = 6.830951895 Simplifying x = 6.830951895

Subproblem 2

x + -1 = -5.830951895 Simplifying x + -1 = -5.830951895 Reorder the terms: -1 + x = -5.830951895 Solving -1 + x = -5.830951895 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 = -5.830951895 + 1 Combine like terms: -1 + 1 = 0 0 + x = -5.830951895 + 1 x = -5.830951895 + 1 Combine like terms: -5.830951895 + 1 = -4.830951895 x = -4.830951895 Simplifying x = -4.830951895

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.830951895, -4.830951895}

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