3x^2+5x-256=0

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Solution for 3x^2+5x-256=0 equation: 


Simplifying
3x2 + 5x + -256 = 0

Reorder the terms:
-256 + 5x + 3x2 = 0

Solving
-256 + 5x + 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'.
-85.33333333 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '85.33333333' to each side of the equation.
-85.33333333 + 1.666666667x + 85.33333333 + x2 = 0 + 85.33333333

Reorder the terms:
-85.33333333 + 85.33333333 + 1.666666667x + x2 = 0 + 85.33333333

Combine like terms: -85.33333333 + 85.33333333 = 0.00000000
0.00000000 + 1.666666667x + x2 = 0 + 85.33333333
1.666666667x + x2 = 0 + 85.33333333

Combine like terms: 0 + 85.33333333 = 85.33333333
1.666666667x + x2 = 85.33333333

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 85.33333333 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 85.33333333 + 0.6944444447

Combine like terms: 85.33333333 + 0.6944444447 = 86.0277777747
0.6944444447 + 1.666666667x + x2 = 86.0277777747

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 86.0277777747

Calculate the square root of the right side: 9.275116052

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 9.275116052 and -9.275116052.


Subproblem 1
x + 0.8333333335 = 9.275116052

Simplifying
x + 0.8333333335 = 9.275116052

Reorder the terms:
0.8333333335 + x = 9.275116052

Solving
0.8333333335 + x = 9.275116052

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.8333333335' to each side of the equation.
0.8333333335 + -0.8333333335 + x = 9.275116052 + -0.8333333335

Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000
0.0000000000 + x = 9.275116052 + -0.8333333335
x = 9.275116052 + -0.8333333335

Combine like terms: 9.275116052 + -0.8333333335 = 8.4417827185
x = 8.4417827185

Simplifying
x = 8.4417827185


Subproblem 2
x + 0.8333333335 = -9.275116052

Simplifying
x + 0.8333333335 = -9.275116052

Reorder the terms:
0.8333333335 + x = -9.275116052

Solving
0.8333333335 + x = -9.275116052

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.8333333335' to each side of the equation.
0.8333333335 + -0.8333333335 + x = -9.275116052 + -0.8333333335

Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000
0.0000000000 + x = -9.275116052 + -0.8333333335
x = -9.275116052 + -0.8333333335

Combine like terms: -9.275116052 + -0.8333333335 = -10.1084493855
x = -10.1084493855

Simplifying
x = -10.1084493855


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {8.4417827185, -10.1084493855}

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