x^2-6x-80=0

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Solution for x^2-6x-80=0 equation:


Simplifying
x2 + -6x + -80 = 0

Reorder the terms:
-80 + -6x + x2 = 0

Solving
-80 + -6x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + -6x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + -6x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + -6x + x2 = 0 + 80
-6x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
-6x + x2 = 80

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 = 80 + 9

Reorder the terms:
9 + -6x + x2 = 80 + 9

Combine like terms: 80 + 9 = 89
9 + -6x + x2 = 89

Factor a perfect square on the left side:
(x + -3)(x + -3) = 89

Calculate the square root of the right side: 9.433981132

Break this problem into two subproblems by setting 
(x + -3) equal to 9.433981132 and -9.433981132.

Subproblem 1

x + -3 = 9.433981132 Simplifying x + -3 = 9.433981132 Reorder the terms: -3 + x = 9.433981132 Solving -3 + x = 9.433981132 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 = 9.433981132 + 3 Combine like terms: -3 + 3 = 0 0 + x = 9.433981132 + 3 x = 9.433981132 + 3 Combine like terms: 9.433981132 + 3 = 12.433981132 x = 12.433981132 Simplifying x = 12.433981132

Subproblem 2

x + -3 = -9.433981132 Simplifying x + -3 = -9.433981132 Reorder the terms: -3 + x = -9.433981132 Solving -3 + x = -9.433981132 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 = -9.433981132 + 3 Combine like terms: -3 + 3 = 0 0 + x = -9.433981132 + 3 x = -9.433981132 + 3 Combine like terms: -9.433981132 + 3 = -6.433981132 x = -6.433981132 Simplifying x = -6.433981132

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.433981132, -6.433981132}

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