3x^2+17x-7.9=0

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Solution for 3x^2+17x-7.9=0 equation: 


Simplifying
3x2 + 17x + -7.9 = 0

Reorder the terms:
-7.9 + 17x + 3x2 = 0

Solving
-7.9 + 17x + 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 + 5.666666667x + x2 = 0

Move the constant term to the right:

Add '2.633333333' to each side of the equation.
-2.633333333 + 5.666666667x + 2.633333333 + x2 = 0 + 2.633333333

Reorder the terms:
-2.633333333 + 2.633333333 + 5.666666667x + x2 = 0 + 2.633333333

Combine like terms: -2.633333333 + 2.633333333 = 0.000000000
0.000000000 + 5.666666667x + x2 = 0 + 2.633333333
5.666666667x + x2 = 0 + 2.633333333

Combine like terms: 0 + 2.633333333 = 2.633333333
5.666666667x + x2 = 2.633333333

The x term is 5.666666667x.  Take half its coefficient (2.833333334).
Square it (8.027777782) and add it to both sides.

Add '8.027777782' to each side of the equation.
5.666666667x + 8.027777782 + x2 = 2.633333333 + 8.027777782

Reorder the terms:
8.027777782 + 5.666666667x + x2 = 2.633333333 + 8.027777782

Combine like terms: 2.633333333 + 8.027777782 = 10.661111115
8.027777782 + 5.666666667x + x2 = 10.661111115

Factor a perfect square on the left side:
(x + 2.833333334)(x + 2.833333334) = 10.661111115

Calculate the square root of the right side: 3.265135696

Break this problem into two subproblems by setting 
(x + 2.833333334) equal to 3.265135696 and -3.265135696.


Subproblem 1
x + 2.833333334 = 3.265135696

Simplifying
x + 2.833333334 = 3.265135696

Reorder the terms:
2.833333334 + x = 3.265135696

Solving
2.833333334 + x = 3.265135696

Solving for variable 'x'.

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

Add '-2.833333334' to each side of the equation.
2.833333334 + -2.833333334 + x = 3.265135696 + -2.833333334

Combine like terms: 2.833333334 + -2.833333334 = 0.000000000
0.000000000 + x = 3.265135696 + -2.833333334
x = 3.265135696 + -2.833333334

Combine like terms: 3.265135696 + -2.833333334 = 0.431802362
x = 0.431802362

Simplifying
x = 0.431802362


Subproblem 2
x + 2.833333334 = -3.265135696

Simplifying
x + 2.833333334 = -3.265135696

Reorder the terms:
2.833333334 + x = -3.265135696

Solving
2.833333334 + x = -3.265135696

Solving for variable 'x'.

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

Add '-2.833333334' to each side of the equation.
2.833333334 + -2.833333334 + x = -3.265135696 + -2.833333334

Combine like terms: 2.833333334 + -2.833333334 = 0.000000000
0.000000000 + x = -3.265135696 + -2.833333334
x = -3.265135696 + -2.833333334

Combine like terms: -3.265135696 + -2.833333334 = -6.09846903
x = -6.09846903

Simplifying
x = -6.09846903


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.431802362, -6.09846903}

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