3x^2-6x-80=0

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Solution for 3x^2-6x-80=0 equation:


Simplifying
3x2 + -6x + -80 = 0

Reorder the terms:
-80 + -6x + 3x2 = 0

Solving
-80 + -6x + 3x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-26.66666667 + -2x + x2 = 0

Move the constant term to the right:

Add '26.66666667' to each side of the equation.
-26.66666667 + -2x + 26.66666667 + x2 = 0 + 26.66666667

Reorder the terms:
-26.66666667 + 26.66666667 + -2x + x2 = 0 + 26.66666667

Combine like terms: -26.66666667 + 26.66666667 = 0.00000000
0.00000000 + -2x + x2 = 0 + 26.66666667
-2x + x2 = 0 + 26.66666667

Combine like terms: 0 + 26.66666667 = 26.66666667
-2x + x2 = 26.66666667

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 26.66666667 + 1

Reorder the terms:
1 + -2x + x2 = 26.66666667 + 1

Combine like terms: 26.66666667 + 1 = 27.66666667
1 + -2x + x2 = 27.66666667

Factor a perfect square on the left side:
(x + -1)(x + -1) = 27.66666667

Calculate the square root of the right side: 5.25991128

Break this problem into two subproblems by setting 
(x + -1) equal to 5.25991128 and -5.25991128.

Subproblem 1

x + -1 = 5.25991128 Simplifying x + -1 = 5.25991128 Reorder the terms: -1 + x = 5.25991128 Solving -1 + x = 5.25991128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 5.25991128 + 1 Combine like terms: -1 + 1 = 0 0 + x = 5.25991128 + 1 x = 5.25991128 + 1 Combine like terms: 5.25991128 + 1 = 6.25991128 x = 6.25991128 Simplifying x = 6.25991128

Subproblem 2

x + -1 = -5.25991128 Simplifying x + -1 = -5.25991128 Reorder the terms: -1 + x = -5.25991128 Solving -1 + x = -5.25991128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -5.25991128 + 1 Combine like terms: -1 + 1 = 0 0 + x = -5.25991128 + 1 x = -5.25991128 + 1 Combine like terms: -5.25991128 + 1 = -4.25991128 x = -4.25991128 Simplifying x = -4.25991128

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.25991128, -4.25991128}

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