2x^2-12x-5=0

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Solution for 2x^2-12x-5=0 equation:


Simplifying
2x2 + -12x + -5 = 0

Reorder the terms:
-5 + -12x + 2x2 = 0

Solving
-5 + -12x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-2.5 + -6x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -6x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -6x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -6x + x2 = 0 + 2.5
-6x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-6x + x2 = 2.5

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 = 2.5 + 9

Reorder the terms:
9 + -6x + x2 = 2.5 + 9

Combine like terms: 2.5 + 9 = 11.5
9 + -6x + x2 = 11.5

Factor a perfect square on the left side:
(x + -3)(x + -3) = 11.5

Calculate the square root of the right side: 3.391164992

Break this problem into two subproblems by setting 
(x + -3) equal to 3.391164992 and -3.391164992.

Subproblem 1

x + -3 = 3.391164992 Simplifying x + -3 = 3.391164992 Reorder the terms: -3 + x = 3.391164992 Solving -3 + x = 3.391164992 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 = 3.391164992 + 3 Combine like terms: -3 + 3 = 0 0 + x = 3.391164992 + 3 x = 3.391164992 + 3 Combine like terms: 3.391164992 + 3 = 6.391164992 x = 6.391164992 Simplifying x = 6.391164992

Subproblem 2

x + -3 = -3.391164992 Simplifying x + -3 = -3.391164992 Reorder the terms: -3 + x = -3.391164992 Solving -3 + x = -3.391164992 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 = -3.391164992 + 3 Combine like terms: -3 + 3 = 0 0 + x = -3.391164992 + 3 x = -3.391164992 + 3 Combine like terms: -3.391164992 + 3 = -0.391164992 x = -0.391164992 Simplifying x = -0.391164992

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.391164992, -0.391164992}

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