3x^2+19x-7.9=0

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Solution for 3x^2+19x-7.9=0 equation: 


Simplifying
3x2 + 19x + -7.9 = 0

Reorder the terms:
-7.9 + 19x + 3x2 = 0

Solving
-7.9 + 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'.
-2.633333333 + 6.333333333x + x2 = 0

Move the constant term to the right:

Add '2.633333333' to each side of the equation.
-2.633333333 + 6.333333333x + 2.633333333 + x2 = 0 + 2.633333333

Reorder the terms:
-2.633333333 + 2.633333333 + 6.333333333x + x2 = 0 + 2.633333333

Combine like terms: -2.633333333 + 2.633333333 = 0.000000000
0.000000000 + 6.333333333x + x2 = 0 + 2.633333333
6.333333333x + x2 = 0 + 2.633333333

Combine like terms: 0 + 2.633333333 = 2.633333333
6.333333333x + x2 = 2.633333333

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 = 2.633333333 + 10.02777778

Reorder the terms:
10.02777778 + 6.333333333x + x2 = 2.633333333 + 10.02777778

Combine like terms: 2.633333333 + 10.02777778 = 12.661111113
10.02777778 + 6.333333333x + x2 = 12.661111113

Factor a perfect square on the left side:
(x + 3.166666667)(x + 3.166666667) = 12.661111113

Calculate the square root of the right side: 3.558245511

Break this problem into two subproblems by setting 
(x + 3.166666667) equal to 3.558245511 and -3.558245511.


Subproblem 1
x + 3.166666667 = 3.558245511

Simplifying
x + 3.166666667 = 3.558245511

Reorder the terms:
3.166666667 + x = 3.558245511

Solving
3.166666667 + x = 3.558245511

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 = 3.558245511 + -3.166666667

Combine like terms: 3.166666667 + -3.166666667 = 0.000000000
0.000000000 + x = 3.558245511 + -3.166666667
x = 3.558245511 + -3.166666667

Combine like terms: 3.558245511 + -3.166666667 = 0.391578844
x = 0.391578844

Simplifying
x = 0.391578844


Subproblem 2
x + 3.166666667 = -3.558245511

Simplifying
x + 3.166666667 = -3.558245511

Reorder the terms:
3.166666667 + x = -3.558245511

Solving
3.166666667 + x = -3.558245511

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 = -3.558245511 + -3.166666667

Combine like terms: 3.166666667 + -3.166666667 = 0.000000000
0.000000000 + x = -3.558245511 + -3.166666667
x = -3.558245511 + -3.166666667

Combine like terms: -3.558245511 + -3.166666667 = -6.724912178
x = -6.724912178

Simplifying
x = -6.724912178


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.391578844, -6.724912178}

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