x^2-14x-1=25

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Solution for x^2-14x-1=25 equation:


Simplifying
x2 + -14x + -1 = 25

Reorder the terms:
-1 + -14x + x2 = 25

Solving
-1 + -14x + x2 = 25

Solving for variable 'x'.

Reorder the terms:
-1 + -25 + -14x + x2 = 25 + -25

Combine like terms: -1 + -25 = -26
-26 + -14x + x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-26 + -14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + -14x + 26 + x2 = 0 + 26

Reorder the terms:
-26 + 26 + -14x + x2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + -14x + x2 = 0 + 26
-14x + x2 = 0 + 26

Combine like terms: 0 + 26 = 26
-14x + x2 = 26

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = 26 + 49

Reorder the terms:
49 + -14x + x2 = 26 + 49

Combine like terms: 26 + 49 = 75
49 + -14x + x2 = 75

Factor a perfect square on the left side:
(x + -7)(x + -7) = 75

Calculate the square root of the right side: 8.660254038

Break this problem into two subproblems by setting 
(x + -7) equal to 8.660254038 and -8.660254038.

Subproblem 1

x + -7 = 8.660254038 Simplifying x + -7 = 8.660254038 Reorder the terms: -7 + x = 8.660254038 Solving -7 + x = 8.660254038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 8.660254038 + 7 Combine like terms: -7 + 7 = 0 0 + x = 8.660254038 + 7 x = 8.660254038 + 7 Combine like terms: 8.660254038 + 7 = 15.660254038 x = 15.660254038 Simplifying x = 15.660254038

Subproblem 2

x + -7 = -8.660254038 Simplifying x + -7 = -8.660254038 Reorder the terms: -7 + x = -8.660254038 Solving -7 + x = -8.660254038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -8.660254038 + 7 Combine like terms: -7 + 7 = 0 0 + x = -8.660254038 + 7 x = -8.660254038 + 7 Combine like terms: -8.660254038 + 7 = -1.660254038 x = -1.660254038 Simplifying x = -1.660254038

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.660254038, -1.660254038}

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