x^2-12x-91=0

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Solution for x^2-12x-91=0 equation:


Simplifying
x2 + -12x + -91 = 0

Reorder the terms:
-91 + -12x + x2 = 0

Solving
-91 + -12x + 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 + -12x + 91 + x2 = 0 + 91

Reorder the terms:
-91 + 91 + -12x + x2 = 0 + 91

Combine like terms: -91 + 91 = 0
0 + -12x + x2 = 0 + 91
-12x + x2 = 0 + 91

Combine like terms: 0 + 91 = 91
-12x + x2 = 91

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = 91 + 36

Reorder the terms:
36 + -12x + x2 = 91 + 36

Combine like terms: 91 + 36 = 127
36 + -12x + x2 = 127

Factor a perfect square on the left side:
(x + -6)(x + -6) = 127

Calculate the square root of the right side: 11.26942767

Break this problem into two subproblems by setting 
(x + -6) equal to 11.26942767 and -11.26942767.

Subproblem 1

x + -6 = 11.26942767 Simplifying x + -6 = 11.26942767 Reorder the terms: -6 + x = 11.26942767 Solving -6 + x = 11.26942767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 11.26942767 + 6 Combine like terms: -6 + 6 = 0 0 + x = 11.26942767 + 6 x = 11.26942767 + 6 Combine like terms: 11.26942767 + 6 = 17.26942767 x = 17.26942767 Simplifying x = 17.26942767

Subproblem 2

x + -6 = -11.26942767 Simplifying x + -6 = -11.26942767 Reorder the terms: -6 + x = -11.26942767 Solving -6 + x = -11.26942767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -11.26942767 + 6 Combine like terms: -6 + 6 = 0 0 + x = -11.26942767 + 6 x = -11.26942767 + 6 Combine like terms: -11.26942767 + 6 = -5.26942767 x = -5.26942767 Simplifying x = -5.26942767

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.26942767, -5.26942767}

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