5x^2-18x-6=0

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


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

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

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

Solving for variable 'x'.

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

Divide each side by '5'.
-1.2 + -3.6x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + -3.6x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + -3.6x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + -3.6x + x2 = 0 + 1.2
-3.6x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
-3.6x + x2 = 1.2

The x term is -3.6x.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6x + 3.24 + x2 = 1.2 + 3.24

Reorder the terms:
3.24 + -3.6x + x2 = 1.2 + 3.24

Combine like terms: 1.2 + 3.24 = 4.44
3.24 + -3.6x + x2 = 4.44

Factor a perfect square on the left side:
(x + -1.8)(x + -1.8) = 4.44

Calculate the square root of the right side: 2.107130751

Break this problem into two subproblems by setting 
(x + -1.8) equal to 2.107130751 and -2.107130751.

Subproblem 1

x + -1.8 = 2.107130751 Simplifying x + -1.8 = 2.107130751 Reorder the terms: -1.8 + x = 2.107130751 Solving -1.8 + x = 2.107130751 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = 2.107130751 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = 2.107130751 + 1.8 x = 2.107130751 + 1.8 Combine like terms: 2.107130751 + 1.8 = 3.907130751 x = 3.907130751 Simplifying x = 3.907130751

Subproblem 2

x + -1.8 = -2.107130751 Simplifying x + -1.8 = -2.107130751 Reorder the terms: -1.8 + x = -2.107130751 Solving -1.8 + x = -2.107130751 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = -2.107130751 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = -2.107130751 + 1.8 x = -2.107130751 + 1.8 Combine like terms: -2.107130751 + 1.8 = -0.307130751 x = -0.307130751 Simplifying x = -0.307130751

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.907130751, -0.307130751}

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