5x+3x(x+9)=107

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Solution for 5x+3x(x+9)=107 equation:


Simplifying
5x + 3x(x + 9) = 107

Reorder the terms:
5x + 3x(9 + x) = 107
5x + (9 * 3x + x * 3x) = 107
5x + (27x + 3x2) = 107

Combine like terms: 5x + 27x = 32x
32x + 3x2 = 107

Solving
32x + 3x2 = 107

Solving for variable 'x'.

Reorder the terms:
-107 + 32x + 3x2 = 107 + -107

Combine like terms: 107 + -107 = 0
-107 + 32x + 3x2 = 0

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

Divide each side by '3'.
-35.66666667 + 10.66666667x + x2 = 0

Move the constant term to the right:

Add '35.66666667' to each side of the equation.
-35.66666667 + 10.66666667x + 35.66666667 + x2 = 0 + 35.66666667

Reorder the terms:
-35.66666667 + 35.66666667 + 10.66666667x + x2 = 0 + 35.66666667

Combine like terms: -35.66666667 + 35.66666667 = 0.00000000
0.00000000 + 10.66666667x + x2 = 0 + 35.66666667
10.66666667x + x2 = 0 + 35.66666667

Combine like terms: 0 + 35.66666667 = 35.66666667
10.66666667x + x2 = 35.66666667

The x term is 10.66666667x.  Take half its coefficient (5.333333335).
Square it (28.44444446) and add it to both sides.

Add '28.44444446' to each side of the equation.
10.66666667x + 28.44444446 + x2 = 35.66666667 + 28.44444446

Reorder the terms:
28.44444446 + 10.66666667x + x2 = 35.66666667 + 28.44444446

Combine like terms: 35.66666667 + 28.44444446 = 64.11111113
28.44444446 + 10.66666667x + x2 = 64.11111113

Factor a perfect square on the left side:
(x + 5.333333335)(x + 5.333333335) = 64.11111113

Calculate the square root of the right side: 8.006941434

Break this problem into two subproblems by setting 
(x + 5.333333335) equal to 8.006941434 and -8.006941434.

Subproblem 1

x + 5.333333335 = 8.006941434 Simplifying x + 5.333333335 = 8.006941434 Reorder the terms: 5.333333335 + x = 8.006941434 Solving 5.333333335 + x = 8.006941434 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.333333335' to each side of the equation. 5.333333335 + -5.333333335 + x = 8.006941434 + -5.333333335 Combine like terms: 5.333333335 + -5.333333335 = 0.000000000 0.000000000 + x = 8.006941434 + -5.333333335 x = 8.006941434 + -5.333333335 Combine like terms: 8.006941434 + -5.333333335 = 2.673608099 x = 2.673608099 Simplifying x = 2.673608099

Subproblem 2

x + 5.333333335 = -8.006941434 Simplifying x + 5.333333335 = -8.006941434 Reorder the terms: 5.333333335 + x = -8.006941434 Solving 5.333333335 + x = -8.006941434 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.333333335' to each side of the equation. 5.333333335 + -5.333333335 + x = -8.006941434 + -5.333333335 Combine like terms: 5.333333335 + -5.333333335 = 0.000000000 0.000000000 + x = -8.006941434 + -5.333333335 x = -8.006941434 + -5.333333335 Combine like terms: -8.006941434 + -5.333333335 = -13.340274769 x = -13.340274769 Simplifying x = -13.340274769

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.673608099, -13.340274769}

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