3x^2+48x+128=0

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Solution for 3x^2+48x+128=0 equation:


Simplifying
3x2 + 48x + 128 = 0

Reorder the terms:
128 + 48x + 3x2 = 0

Solving
128 + 48x + 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'.
42.66666667 + 16x + x2 = 0

Move the constant term to the right:

Add '-42.66666667' to each side of the equation.
42.66666667 + 16x + -42.66666667 + x2 = 0 + -42.66666667

Reorder the terms:
42.66666667 + -42.66666667 + 16x + x2 = 0 + -42.66666667

Combine like terms: 42.66666667 + -42.66666667 = 0.00000000
0.00000000 + 16x + x2 = 0 + -42.66666667
16x + x2 = 0 + -42.66666667

Combine like terms: 0 + -42.66666667 = -42.66666667
16x + x2 = -42.66666667

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = -42.66666667 + 64

Reorder the terms:
64 + 16x + x2 = -42.66666667 + 64

Combine like terms: -42.66666667 + 64 = 21.33333333
64 + 16x + x2 = 21.33333333

Factor a perfect square on the left side:
(x + 8)(x + 8) = 21.33333333

Calculate the square root of the right side: 4.618802153

Break this problem into two subproblems by setting 
(x + 8) equal to 4.618802153 and -4.618802153.

Subproblem 1

x + 8 = 4.618802153 Simplifying x + 8 = 4.618802153 Reorder the terms: 8 + x = 4.618802153 Solving 8 + x = 4.618802153 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 4.618802153 + -8 Combine like terms: 8 + -8 = 0 0 + x = 4.618802153 + -8 x = 4.618802153 + -8 Combine like terms: 4.618802153 + -8 = -3.381197847 x = -3.381197847 Simplifying x = -3.381197847

Subproblem 2

x + 8 = -4.618802153 Simplifying x + 8 = -4.618802153 Reorder the terms: 8 + x = -4.618802153 Solving 8 + x = -4.618802153 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -4.618802153 + -8 Combine like terms: 8 + -8 = 0 0 + x = -4.618802153 + -8 x = -4.618802153 + -8 Combine like terms: -4.618802153 + -8 = -12.618802153 x = -12.618802153 Simplifying x = -12.618802153

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.381197847, -12.618802153}

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