5x^2-36x-108=0

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Solution for 5x^2-36x-108=0 equation:


Simplifying
5x2 + -36x + -108 = 0

Reorder the terms:
-108 + -36x + 5x2 = 0

Solving
-108 + -36x + 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'.
-21.6 + -7.2x + x2 = 0

Move the constant term to the right:

Add '21.6' to each side of the equation.
-21.6 + -7.2x + 21.6 + x2 = 0 + 21.6

Reorder the terms:
-21.6 + 21.6 + -7.2x + x2 = 0 + 21.6

Combine like terms: -21.6 + 21.6 = 0.0
0.0 + -7.2x + x2 = 0 + 21.6
-7.2x + x2 = 0 + 21.6

Combine like terms: 0 + 21.6 = 21.6
-7.2x + x2 = 21.6

The x term is -7.2x.  Take half its coefficient (-3.6).
Square it (12.96) and add it to both sides.

Add '12.96' to each side of the equation.
-7.2x + 12.96 + x2 = 21.6 + 12.96

Reorder the terms:
12.96 + -7.2x + x2 = 21.6 + 12.96

Combine like terms: 21.6 + 12.96 = 34.56
12.96 + -7.2x + x2 = 34.56

Factor a perfect square on the left side:
(x + -3.6)(x + -3.6) = 34.56

Calculate the square root of the right side: 5.878775383

Break this problem into two subproblems by setting 
(x + -3.6) equal to 5.878775383 and -5.878775383.

Subproblem 1

x + -3.6 = 5.878775383 Simplifying x + -3.6 = 5.878775383 Reorder the terms: -3.6 + x = 5.878775383 Solving -3.6 + x = 5.878775383 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.6' to each side of the equation. -3.6 + 3.6 + x = 5.878775383 + 3.6 Combine like terms: -3.6 + 3.6 = 0.0 0.0 + x = 5.878775383 + 3.6 x = 5.878775383 + 3.6 Combine like terms: 5.878775383 + 3.6 = 9.478775383 x = 9.478775383 Simplifying x = 9.478775383

Subproblem 2

x + -3.6 = -5.878775383 Simplifying x + -3.6 = -5.878775383 Reorder the terms: -3.6 + x = -5.878775383 Solving -3.6 + x = -5.878775383 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.6' to each side of the equation. -3.6 + 3.6 + x = -5.878775383 + 3.6 Combine like terms: -3.6 + 3.6 = 0.0 0.0 + x = -5.878775383 + 3.6 x = -5.878775383 + 3.6 Combine like terms: -5.878775383 + 3.6 = -2.278775383 x = -2.278775383 Simplifying x = -2.278775383

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.478775383, -2.278775383}

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