x^2-6x-91=10

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Solution for x^2-6x-91=10 equation:


Simplifying
x2 + -6x + -91 = 10

Reorder the terms:
-91 + -6x + x2 = 10

Solving
-91 + -6x + x2 = 10

Solving for variable 'x'.

Reorder the terms:
-91 + -10 + -6x + x2 = 10 + -10

Combine like terms: -91 + -10 = -101
-101 + -6x + x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-101 + -6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '101' to each side of the equation.
-101 + -6x + 101 + x2 = 0 + 101

Reorder the terms:
-101 + 101 + -6x + x2 = 0 + 101

Combine like terms: -101 + 101 = 0
0 + -6x + x2 = 0 + 101
-6x + x2 = 0 + 101

Combine like terms: 0 + 101 = 101
-6x + x2 = 101

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 101 + 9

Reorder the terms:
9 + -6x + x2 = 101 + 9

Combine like terms: 101 + 9 = 110
9 + -6x + x2 = 110

Factor a perfect square on the left side:
(x + -3)(x + -3) = 110

Calculate the square root of the right side: 10.488088482

Break this problem into two subproblems by setting 
(x + -3) equal to 10.488088482 and -10.488088482.

Subproblem 1

x + -3 = 10.488088482 Simplifying x + -3 = 10.488088482 Reorder the terms: -3 + x = 10.488088482 Solving -3 + x = 10.488088482 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 10.488088482 + 3 Combine like terms: -3 + 3 = 0 0 + x = 10.488088482 + 3 x = 10.488088482 + 3 Combine like terms: 10.488088482 + 3 = 13.488088482 x = 13.488088482 Simplifying x = 13.488088482

Subproblem 2

x + -3 = -10.488088482 Simplifying x + -3 = -10.488088482 Reorder the terms: -3 + x = -10.488088482 Solving -3 + x = -10.488088482 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -10.488088482 + 3 Combine like terms: -3 + 3 = 0 0 + x = -10.488088482 + 3 x = -10.488088482 + 3 Combine like terms: -10.488088482 + 3 = -7.488088482 x = -7.488088482 Simplifying x = -7.488088482

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.488088482, -7.488088482}

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