(3x+4)(3x+4)=18

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Solution for (3x+4)(3x+4)=18 equation:


Simplifying
(3x + 4)(3x + 4) = 18

Reorder the terms:
(4 + 3x)(3x + 4) = 18

Reorder the terms:
(4 + 3x)(4 + 3x) = 18

Multiply (4 + 3x) * (4 + 3x)
(4(4 + 3x) + 3x * (4 + 3x)) = 18
((4 * 4 + 3x * 4) + 3x * (4 + 3x)) = 18
((16 + 12x) + 3x * (4 + 3x)) = 18
(16 + 12x + (4 * 3x + 3x * 3x)) = 18
(16 + 12x + (12x + 9x2)) = 18

Combine like terms: 12x + 12x = 24x
(16 + 24x + 9x2) = 18

Solving
16 + 24x + 9x2 = 18

Solving for variable 'x'.

Reorder the terms:
16 + -18 + 24x + 9x2 = 18 + -18

Combine like terms: 16 + -18 = -2
-2 + 24x + 9x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-2 + 24x + 9x2 = 0

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

Divide each side by '9'.
-0.2222222222 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + 2.666666667x + 0.2222222222 + x2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + 2.666666667x + x2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + 2.666666667x + x2 = 0 + 0.2222222222
2.666666667x + x2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
2.666666667x + x2 = 0.2222222222

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 0.2222222222 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 0.2222222222 + 1.777777780

Combine like terms: 0.2222222222 + 1.777777780 = 2.0000000022
1.777777780 + 2.666666667x + x2 = 2.0000000022

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 2.0000000022

Calculate the square root of the right side: 1.414213563

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 1.414213563 and -1.414213563.

Subproblem 1

x + 1.333333334 = 1.414213563 Simplifying x + 1.333333334 = 1.414213563 Reorder the terms: 1.333333334 + x = 1.414213563 Solving 1.333333334 + x = 1.414213563 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 1.414213563 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 1.414213563 + -1.333333334 x = 1.414213563 + -1.333333334 Combine like terms: 1.414213563 + -1.333333334 = 0.080880229 x = 0.080880229 Simplifying x = 0.080880229

Subproblem 2

x + 1.333333334 = -1.414213563 Simplifying x + 1.333333334 = -1.414213563 Reorder the terms: 1.333333334 + x = -1.414213563 Solving 1.333333334 + x = -1.414213563 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -1.414213563 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -1.414213563 + -1.333333334 x = -1.414213563 + -1.333333334 Combine like terms: -1.414213563 + -1.333333334 = -2.747546897 x = -2.747546897 Simplifying x = -2.747546897

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.080880229, -2.747546897}

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