5x^2+54x+135=0

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Solution for 5x^2+54x+135=0 equation:


Simplifying
5x2 + 54x + 135 = 0

Reorder the terms:
135 + 54x + 5x2 = 0

Solving
135 + 54x + 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'.
27 + 10.8x + x2 = 0

Move the constant term to the right:

Add '-27' to each side of the equation.
27 + 10.8x + -27 + x2 = 0 + -27

Reorder the terms:
27 + -27 + 10.8x + x2 = 0 + -27

Combine like terms: 27 + -27 = 0
0 + 10.8x + x2 = 0 + -27
10.8x + x2 = 0 + -27

Combine like terms: 0 + -27 = -27
10.8x + x2 = -27

The x term is 10.8x.  Take half its coefficient (5.4).
Square it (29.16) and add it to both sides.

Add '29.16' to each side of the equation.
10.8x + 29.16 + x2 = -27 + 29.16

Reorder the terms:
29.16 + 10.8x + x2 = -27 + 29.16

Combine like terms: -27 + 29.16 = 2.16
29.16 + 10.8x + x2 = 2.16

Factor a perfect square on the left side:
(x + 5.4)(x + 5.4) = 2.16

Calculate the square root of the right side: 1.469693846

Break this problem into two subproblems by setting 
(x + 5.4) equal to 1.469693846 and -1.469693846.

Subproblem 1

x + 5.4 = 1.469693846 Simplifying x + 5.4 = 1.469693846 Reorder the terms: 5.4 + x = 1.469693846 Solving 5.4 + x = 1.469693846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.4' to each side of the equation. 5.4 + -5.4 + x = 1.469693846 + -5.4 Combine like terms: 5.4 + -5.4 = 0.0 0.0 + x = 1.469693846 + -5.4 x = 1.469693846 + -5.4 Combine like terms: 1.469693846 + -5.4 = -3.930306154 x = -3.930306154 Simplifying x = -3.930306154

Subproblem 2

x + 5.4 = -1.469693846 Simplifying x + 5.4 = -1.469693846 Reorder the terms: 5.4 + x = -1.469693846 Solving 5.4 + x = -1.469693846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.4' to each side of the equation. 5.4 + -5.4 + x = -1.469693846 + -5.4 Combine like terms: 5.4 + -5.4 = 0.0 0.0 + x = -1.469693846 + -5.4 x = -1.469693846 + -5.4 Combine like terms: -1.469693846 + -5.4 = -6.869693846 x = -6.869693846 Simplifying x = -6.869693846

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.930306154, -6.869693846}

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