18x^2+27x+5=0

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Solution for 18x^2+27x+5=0 equation:


Simplifying
18x2 + 27x + 5 = 0

Reorder the terms:
5 + 27x + 18x2 = 0

Solving
5 + 27x + 18x2 = 0

Solving for variable 'x'.

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

Divide each side by '18'.
0.2777777778 + 1.5x + x2 = 0

Move the constant term to the right:

Add '-0.2777777778' to each side of the equation.
0.2777777778 + 1.5x + -0.2777777778 + x2 = 0 + -0.2777777778

Reorder the terms:
0.2777777778 + -0.2777777778 + 1.5x + x2 = 0 + -0.2777777778

Combine like terms: 0.2777777778 + -0.2777777778 = 0.0000000000
0.0000000000 + 1.5x + x2 = 0 + -0.2777777778
1.5x + x2 = 0 + -0.2777777778

Combine like terms: 0 + -0.2777777778 = -0.2777777778
1.5x + x2 = -0.2777777778

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = -0.2777777778 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = -0.2777777778 + 0.5625

Combine like terms: -0.2777777778 + 0.5625 = 0.2847222222
0.5625 + 1.5x + x2 = 0.2847222222

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 0.2847222222

Calculate the square root of the right side: 0.533593686

Break this problem into two subproblems by setting 
(x + 0.75) equal to 0.533593686 and -0.533593686.

Subproblem 1

x + 0.75 = 0.533593686 Simplifying x + 0.75 = 0.533593686 Reorder the terms: 0.75 + x = 0.533593686 Solving 0.75 + x = 0.533593686 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 0.533593686 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 0.533593686 + -0.75 x = 0.533593686 + -0.75 Combine like terms: 0.533593686 + -0.75 = -0.216406314 x = -0.216406314 Simplifying x = -0.216406314

Subproblem 2

x + 0.75 = -0.533593686 Simplifying x + 0.75 = -0.533593686 Reorder the terms: 0.75 + x = -0.533593686 Solving 0.75 + x = -0.533593686 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -0.533593686 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -0.533593686 + -0.75 x = -0.533593686 + -0.75 Combine like terms: -0.533593686 + -0.75 = -1.283593686 x = -1.283593686 Simplifying x = -1.283593686

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.216406314, -1.283593686}

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