3x^2-19x-9=0

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Solution for 3x^2-19x-9=0 equation:


Simplifying
3x2 + -19x + -9 = 0

Reorder the terms:
-9 + -19x + 3x2 = 0

Solving
-9 + -19x + 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'.
-3 + -6.333333333x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -6.333333333x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -6.333333333x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -6.333333333x + x2 = 0 + 3
-6.333333333x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-6.333333333x + x2 = 3

The x term is -6.333333333x.  Take half its coefficient (-3.166666667).
Square it (10.02777778) and add it to both sides.

Add '10.02777778' to each side of the equation.
-6.333333333x + 10.02777778 + x2 = 3 + 10.02777778

Reorder the terms:
10.02777778 + -6.333333333x + x2 = 3 + 10.02777778

Combine like terms: 3 + 10.02777778 = 13.02777778
10.02777778 + -6.333333333x + x2 = 13.02777778

Factor a perfect square on the left side:
(x + -3.166666667)(x + -3.166666667) = 13.02777778

Calculate the square root of the right side: 3.609401305

Break this problem into two subproblems by setting 
(x + -3.166666667) equal to 3.609401305 and -3.609401305.

Subproblem 1

x + -3.166666667 = 3.609401305 Simplifying x + -3.166666667 = 3.609401305 Reorder the terms: -3.166666667 + x = 3.609401305 Solving -3.166666667 + x = 3.609401305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.166666667' to each side of the equation. -3.166666667 + 3.166666667 + x = 3.609401305 + 3.166666667 Combine like terms: -3.166666667 + 3.166666667 = 0.000000000 0.000000000 + x = 3.609401305 + 3.166666667 x = 3.609401305 + 3.166666667 Combine like terms: 3.609401305 + 3.166666667 = 6.776067972 x = 6.776067972 Simplifying x = 6.776067972

Subproblem 2

x + -3.166666667 = -3.609401305 Simplifying x + -3.166666667 = -3.609401305 Reorder the terms: -3.166666667 + x = -3.609401305 Solving -3.166666667 + x = -3.609401305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.166666667' to each side of the equation. -3.166666667 + 3.166666667 + x = -3.609401305 + 3.166666667 Combine like terms: -3.166666667 + 3.166666667 = 0.000000000 0.000000000 + x = -3.609401305 + 3.166666667 x = -3.609401305 + 3.166666667 Combine like terms: -3.609401305 + 3.166666667 = -0.442734638 x = -0.442734638 Simplifying x = -0.442734638

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.776067972, -0.442734638}

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