3x(x+12)=5

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Solution for 3x(x+12)=5 equation:


Simplifying
3x(x + 12) = 5

Reorder the terms:
3x(12 + x) = 5
(12 * 3x + x * 3x) = 5
(36x + 3x2) = 5

Solving
36x + 3x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 36x + 3x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 36x + 3x2 = 0

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

Divide each side by '3'.
-1.666666667 + 12x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + 12x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + 12x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + 12x + x2 = 0 + 1.666666667
12x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
12x + x2 = 1.666666667

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 1.666666667 + 36

Reorder the terms:
36 + 12x + x2 = 1.666666667 + 36

Combine like terms: 1.666666667 + 36 = 37.666666667
36 + 12x + x2 = 37.666666667

Factor a perfect square on the left side:
(x + 6)(x + 6) = 37.666666667

Calculate the square root of the right side: 6.137317547

Break this problem into two subproblems by setting 
(x + 6) equal to 6.137317547 and -6.137317547.

Subproblem 1

x + 6 = 6.137317547 Simplifying x + 6 = 6.137317547 Reorder the terms: 6 + x = 6.137317547 Solving 6 + x = 6.137317547 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 6.137317547 + -6 Combine like terms: 6 + -6 = 0 0 + x = 6.137317547 + -6 x = 6.137317547 + -6 Combine like terms: 6.137317547 + -6 = 0.137317547 x = 0.137317547 Simplifying x = 0.137317547

Subproblem 2

x + 6 = -6.137317547 Simplifying x + 6 = -6.137317547 Reorder the terms: 6 + x = -6.137317547 Solving 6 + x = -6.137317547 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -6.137317547 + -6 Combine like terms: 6 + -6 = 0 0 + x = -6.137317547 + -6 x = -6.137317547 + -6 Combine like terms: -6.137317547 + -6 = -12.137317547 x = -12.137317547 Simplifying x = -12.137317547

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.137317547, -12.137317547}

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