27x^2+18x=4

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Solution for 27x^2+18x=4 equation:


Simplifying
27x2 + 18x = 4

Reorder the terms:
18x + 27x2 = 4

Solving
18x + 27x2 = 4

Solving for variable 'x'.

Reorder the terms:
-4 + 18x + 27x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 18x + 27x2 = 0

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

Divide each side by '27'.
-0.1481481481 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '0.1481481481' to each side of the equation.
-0.1481481481 + 0.6666666667x + 0.1481481481 + x2 = 0 + 0.1481481481

Reorder the terms:
-0.1481481481 + 0.1481481481 + 0.6666666667x + x2 = 0 + 0.1481481481

Combine like terms: -0.1481481481 + 0.1481481481 = 0.0000000000
0.0000000000 + 0.6666666667x + x2 = 0 + 0.1481481481
0.6666666667x + x2 = 0 + 0.1481481481

Combine like terms: 0 + 0.1481481481 = 0.1481481481
0.6666666667x + x2 = 0.1481481481

The x term is 0.6666666667x.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667x + 0.1111111112 + x2 = 0.1481481481 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 0.1481481481 + 0.1111111112

Combine like terms: 0.1481481481 + 0.1111111112 = 0.2592592593
0.1111111112 + 0.6666666667x + x2 = 0.2592592593

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 0.2592592593

Calculate the square root of the right side: 0.509175077

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 0.509175077 and -0.509175077.

Subproblem 1

x + 0.3333333334 = 0.509175077 Simplifying x + 0.3333333334 = 0.509175077 Reorder the terms: 0.3333333334 + x = 0.509175077 Solving 0.3333333334 + x = 0.509175077 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = 0.509175077 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 0.509175077 + -0.3333333334 x = 0.509175077 + -0.3333333334 Combine like terms: 0.509175077 + -0.3333333334 = 0.1758417436 x = 0.1758417436 Simplifying x = 0.1758417436

Subproblem 2

x + 0.3333333334 = -0.509175077 Simplifying x + 0.3333333334 = -0.509175077 Reorder the terms: 0.3333333334 + x = -0.509175077 Solving 0.3333333334 + x = -0.509175077 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = -0.509175077 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -0.509175077 + -0.3333333334 x = -0.509175077 + -0.3333333334 Combine like terms: -0.509175077 + -0.3333333334 = -0.8425084104 x = -0.8425084104 Simplifying x = -0.8425084104

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.1758417436, -0.8425084104}

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