3x^2+72x+16=0

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Solution for 3x^2+72x+16=0 equation:


Simplifying
3x2 + 72x + 16 = 0

Reorder the terms:
16 + 72x + 3x2 = 0

Solving
16 + 72x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
5.333333333 + 24x + x2 = 0

Move the constant term to the right:

Add '-5.333333333' to each side of the equation.
5.333333333 + 24x + -5.333333333 + x2 = 0 + -5.333333333

Reorder the terms:
5.333333333 + -5.333333333 + 24x + x2 = 0 + -5.333333333

Combine like terms: 5.333333333 + -5.333333333 = 0.000000000
0.000000000 + 24x + x2 = 0 + -5.333333333
24x + x2 = 0 + -5.333333333

Combine like terms: 0 + -5.333333333 = -5.333333333
24x + x2 = -5.333333333

The x term is 24x.  Take half its coefficient (12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
24x + 144 + x2 = -5.333333333 + 144

Reorder the terms:
144 + 24x + x2 = -5.333333333 + 144

Combine like terms: -5.333333333 + 144 = 138.666666667
144 + 24x + x2 = 138.666666667

Factor a perfect square on the left side:
(x + 12)(x + 12) = 138.666666667

Calculate the square root of the right side: 11.775681155

Break this problem into two subproblems by setting 
(x + 12) equal to 11.775681155 and -11.775681155.

Subproblem 1

x + 12 = 11.775681155 Simplifying x + 12 = 11.775681155 Reorder the terms: 12 + x = 11.775681155 Solving 12 + x = 11.775681155 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + x = 11.775681155 + -12 Combine like terms: 12 + -12 = 0 0 + x = 11.775681155 + -12 x = 11.775681155 + -12 Combine like terms: 11.775681155 + -12 = -0.224318845 x = -0.224318845 Simplifying x = -0.224318845

Subproblem 2

x + 12 = -11.775681155 Simplifying x + 12 = -11.775681155 Reorder the terms: 12 + x = -11.775681155 Solving 12 + x = -11.775681155 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + x = -11.775681155 + -12 Combine like terms: 12 + -12 = 0 0 + x = -11.775681155 + -12 x = -11.775681155 + -12 Combine like terms: -11.775681155 + -12 = -23.775681155 x = -23.775681155 Simplifying x = -23.775681155

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.224318845, -23.775681155}

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