x^2-14x-91=0

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Solution for x^2-14x-91=0 equation:


Simplifying
x2 + -14x + -91 = 0

Reorder the terms:
-91 + -14x + x2 = 0

Solving
-91 + -14x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '91' to each side of the equation.
-91 + -14x + 91 + x2 = 0 + 91

Reorder the terms:
-91 + 91 + -14x + x2 = 0 + 91

Combine like terms: -91 + 91 = 0
0 + -14x + x2 = 0 + 91
-14x + x2 = 0 + 91

Combine like terms: 0 + 91 = 91
-14x + x2 = 91

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 = 91 + 49

Reorder the terms:
49 + -14x + x2 = 91 + 49

Combine like terms: 91 + 49 = 140
49 + -14x + x2 = 140

Factor a perfect square on the left side:
(x + -7)(x + -7) = 140

Calculate the square root of the right side: 11.832159566

Break this problem into two subproblems by setting 
(x + -7) equal to 11.832159566 and -11.832159566.

Subproblem 1

x + -7 = 11.832159566 Simplifying x + -7 = 11.832159566 Reorder the terms: -7 + x = 11.832159566 Solving -7 + x = 11.832159566 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 = 11.832159566 + 7 Combine like terms: -7 + 7 = 0 0 + x = 11.832159566 + 7 x = 11.832159566 + 7 Combine like terms: 11.832159566 + 7 = 18.832159566 x = 18.832159566 Simplifying x = 18.832159566

Subproblem 2

x + -7 = -11.832159566 Simplifying x + -7 = -11.832159566 Reorder the terms: -7 + x = -11.832159566 Solving -7 + x = -11.832159566 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 = -11.832159566 + 7 Combine like terms: -7 + 7 = 0 0 + x = -11.832159566 + 7 x = -11.832159566 + 7 Combine like terms: -11.832159566 + 7 = -4.832159566 x = -4.832159566 Simplifying x = -4.832159566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.832159566, -4.832159566}

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