x^2-26x-105=0

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Solution for x^2-26x-105=0 equation:


Simplifying
x2 + -26x + -105 = 0

Reorder the terms:
-105 + -26x + x2 = 0

Solving
-105 + -26x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '105' to each side of the equation.
-105 + -26x + 105 + x2 = 0 + 105

Reorder the terms:
-105 + 105 + -26x + x2 = 0 + 105

Combine like terms: -105 + 105 = 0
0 + -26x + x2 = 0 + 105
-26x + x2 = 0 + 105

Combine like terms: 0 + 105 = 105
-26x + x2 = 105

The x term is -26x.  Take half its coefficient (-13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
-26x + 169 + x2 = 105 + 169

Reorder the terms:
169 + -26x + x2 = 105 + 169

Combine like terms: 105 + 169 = 274
169 + -26x + x2 = 274

Factor a perfect square on the left side:
(x + -13)(x + -13) = 274

Calculate the square root of the right side: 16.552945357

Break this problem into two subproblems by setting 
(x + -13) equal to 16.552945357 and -16.552945357.

Subproblem 1

x + -13 = 16.552945357 Simplifying x + -13 = 16.552945357 Reorder the terms: -13 + x = 16.552945357 Solving -13 + x = 16.552945357 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x = 16.552945357 + 13 Combine like terms: -13 + 13 = 0 0 + x = 16.552945357 + 13 x = 16.552945357 + 13 Combine like terms: 16.552945357 + 13 = 29.552945357 x = 29.552945357 Simplifying x = 29.552945357

Subproblem 2

x + -13 = -16.552945357 Simplifying x + -13 = -16.552945357 Reorder the terms: -13 + x = -16.552945357 Solving -13 + x = -16.552945357 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x = -16.552945357 + 13 Combine like terms: -13 + 13 = 0 0 + x = -16.552945357 + 13 x = -16.552945357 + 13 Combine like terms: -16.552945357 + 13 = -3.552945357 x = -3.552945357 Simplifying x = -3.552945357

Solution

The solution to the problem is based on the solutions from the subproblems. x = {29.552945357, -3.552945357}

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