3x^2+11x-13=0

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Solution for 3x^2+11x-13=0 equation: 


Simplifying
3x2 + 11x + -13 = 0

Reorder the terms:
-13 + 11x + 3x2 = 0

Solving
-13 + 11x + 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'.
-4.333333333 + 3.666666667x + x2 = 0

Move the constant term to the right:

Add '4.333333333' to each side of the equation.
-4.333333333 + 3.666666667x + 4.333333333 + x2 = 0 + 4.333333333

Reorder the terms:
-4.333333333 + 4.333333333 + 3.666666667x + x2 = 0 + 4.333333333

Combine like terms: -4.333333333 + 4.333333333 = 0.000000000
0.000000000 + 3.666666667x + x2 = 0 + 4.333333333
3.666666667x + x2 = 0 + 4.333333333

Combine like terms: 0 + 4.333333333 = 4.333333333
3.666666667x + x2 = 4.333333333

The x term is 3.666666667x.  Take half its coefficient (1.833333334).
Square it (3.361111114) and add it to both sides.

Add '3.361111114' to each side of the equation.
3.666666667x + 3.361111114 + x2 = 4.333333333 + 3.361111114

Reorder the terms:
3.361111114 + 3.666666667x + x2 = 4.333333333 + 3.361111114

Combine like terms: 4.333333333 + 3.361111114 = 7.694444447
3.361111114 + 3.666666667x + x2 = 7.694444447

Factor a perfect square on the left side:
(x + 1.833333334)(x + 1.833333334) = 7.694444447

Calculate the square root of the right side: 2.773886163

Break this problem into two subproblems by setting 
(x + 1.833333334) equal to 2.773886163 and -2.773886163.


Subproblem 1
x + 1.833333334 = 2.773886163

Simplifying
x + 1.833333334 = 2.773886163

Reorder the terms:
1.833333334 + x = 2.773886163

Solving
1.833333334 + x = 2.773886163

Solving for variable 'x'.

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

Add '-1.833333334' to each side of the equation.
1.833333334 + -1.833333334 + x = 2.773886163 + -1.833333334

Combine like terms: 1.833333334 + -1.833333334 = 0.000000000
0.000000000 + x = 2.773886163 + -1.833333334
x = 2.773886163 + -1.833333334

Combine like terms: 2.773886163 + -1.833333334 = 0.940552829
x = 0.940552829

Simplifying
x = 0.940552829


Subproblem 2
x + 1.833333334 = -2.773886163

Simplifying
x + 1.833333334 = -2.773886163

Reorder the terms:
1.833333334 + x = -2.773886163

Solving
1.833333334 + x = -2.773886163

Solving for variable 'x'.

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

Add '-1.833333334' to each side of the equation.
1.833333334 + -1.833333334 + x = -2.773886163 + -1.833333334

Combine like terms: 1.833333334 + -1.833333334 = 0.000000000
0.000000000 + x = -2.773886163 + -1.833333334
x = -2.773886163 + -1.833333334

Combine like terms: -2.773886163 + -1.833333334 = -4.607219497
x = -4.607219497

Simplifying
x = -4.607219497


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.940552829, -4.607219497}

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