5x^2-18x-18=0

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


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

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

Solving
-18 + -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'.
-3.6 + -3.6x + x2 = 0

Move the constant term to the right:

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

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

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

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

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 = 3.6 + 3.24

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

Combine like terms: 3.6 + 3.24 = 6.84
3.24 + -3.6x + x2 = 6.84

Factor a perfect square on the left side:
(x + -1.8)(x + -1.8) = 6.84

Calculate the square root of the right side: 2.615339366

Break this problem into two subproblems by setting 
(x + -1.8) equal to 2.615339366 and -2.615339366.

Subproblem 1

x + -1.8 = 2.615339366 Simplifying x + -1.8 = 2.615339366 Reorder the terms: -1.8 + x = 2.615339366 Solving -1.8 + x = 2.615339366 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 = 2.615339366 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = 2.615339366 + 1.8 x = 2.615339366 + 1.8 Combine like terms: 2.615339366 + 1.8 = 4.415339366 x = 4.415339366 Simplifying x = 4.415339366

Subproblem 2

x + -1.8 = -2.615339366 Simplifying x + -1.8 = -2.615339366 Reorder the terms: -1.8 + x = -2.615339366 Solving -1.8 + x = -2.615339366 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 = -2.615339366 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = -2.615339366 + 1.8 x = -2.615339366 + 1.8 Combine like terms: -2.615339366 + 1.8 = -0.815339366 x = -0.815339366 Simplifying x = -0.815339366

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.415339366, -0.815339366}

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