6x^2-18x-5=0

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Solution for 6x^2-18x-5=0 equation:


Simplifying
6x2 + -18x + -5 = 0

Reorder the terms:
-5 + -18x + 6x2 = 0

Solving
-5 + -18x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-0.8333333333 + -3x + x2 = 0

Move the constant term to the right:

Add '0.8333333333' to each side of the equation.
-0.8333333333 + -3x + 0.8333333333 + x2 = 0 + 0.8333333333

Reorder the terms:
-0.8333333333 + 0.8333333333 + -3x + x2 = 0 + 0.8333333333

Combine like terms: -0.8333333333 + 0.8333333333 = 0.0000000000
0.0000000000 + -3x + x2 = 0 + 0.8333333333
-3x + x2 = 0 + 0.8333333333

Combine like terms: 0 + 0.8333333333 = 0.8333333333
-3x + x2 = 0.8333333333

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 0.8333333333 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 0.8333333333 + 2.25

Combine like terms: 0.8333333333 + 2.25 = 3.0833333333
2.25 + -3x + x2 = 3.0833333333

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 3.0833333333

Calculate the square root of the right side: 1.755942292

Break this problem into two subproblems by setting 
(x + -1.5) equal to 1.755942292 and -1.755942292.

Subproblem 1

x + -1.5 = 1.755942292 Simplifying x + -1.5 = 1.755942292 Reorder the terms: -1.5 + x = 1.755942292 Solving -1.5 + x = 1.755942292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 1.755942292 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 1.755942292 + 1.5 x = 1.755942292 + 1.5 Combine like terms: 1.755942292 + 1.5 = 3.255942292 x = 3.255942292 Simplifying x = 3.255942292

Subproblem 2

x + -1.5 = -1.755942292 Simplifying x + -1.5 = -1.755942292 Reorder the terms: -1.5 + x = -1.755942292 Solving -1.5 + x = -1.755942292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -1.755942292 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -1.755942292 + 1.5 x = -1.755942292 + 1.5 Combine like terms: -1.755942292 + 1.5 = -0.255942292 x = -0.255942292 Simplifying x = -0.255942292

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.255942292, -0.255942292}

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