3x^2-11x+6=13

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Solution for 3x^2-11x+6=13 equation:


Simplifying
3x2 + -11x + 6 = 13

Reorder the terms:
6 + -11x + 3x2 = 13

Solving
6 + -11x + 3x2 = 13

Solving for variable 'x'.

Reorder the terms:
6 + -13 + -11x + 3x2 = 13 + -13

Combine like terms: 6 + -13 = -7
-7 + -11x + 3x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-7 + -11x + 3x2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-2.333333333 + -3.666666667x + x2 = 0

Move the constant term to the right:

Add '2.333333333' to each side of the equation.
-2.333333333 + -3.666666667x + 2.333333333 + x2 = 0 + 2.333333333

Reorder the terms:
-2.333333333 + 2.333333333 + -3.666666667x + x2 = 0 + 2.333333333

Combine like terms: -2.333333333 + 2.333333333 = 0.000000000
0.000000000 + -3.666666667x + x2 = 0 + 2.333333333
-3.666666667x + x2 = 0 + 2.333333333

Combine like terms: 0 + 2.333333333 = 2.333333333
-3.666666667x + x2 = 2.333333333

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 = 2.333333333 + 3.361111114

Reorder the terms:
3.361111114 + -3.666666667x + x2 = 2.333333333 + 3.361111114

Combine like terms: 2.333333333 + 3.361111114 = 5.694444447
3.361111114 + -3.666666667x + x2 = 5.694444447

Factor a perfect square on the left side:
(x + -1.833333334)(x + -1.833333334) = 5.694444447

Calculate the square root of the right side: 2.386303511

Break this problem into two subproblems by setting 
(x + -1.833333334) equal to 2.386303511 and -2.386303511.

Subproblem 1

x + -1.833333334 = 2.386303511 Simplifying x + -1.833333334 = 2.386303511 Reorder the terms: -1.833333334 + x = 2.386303511 Solving -1.833333334 + x = 2.386303511 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 = 2.386303511 + 1.833333334 Combine like terms: -1.833333334 + 1.833333334 = 0.000000000 0.000000000 + x = 2.386303511 + 1.833333334 x = 2.386303511 + 1.833333334 Combine like terms: 2.386303511 + 1.833333334 = 4.219636845 x = 4.219636845 Simplifying x = 4.219636845

Subproblem 2

x + -1.833333334 = -2.386303511 Simplifying x + -1.833333334 = -2.386303511 Reorder the terms: -1.833333334 + x = -2.386303511 Solving -1.833333334 + x = -2.386303511 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 = -2.386303511 + 1.833333334 Combine like terms: -1.833333334 + 1.833333334 = 0.000000000 0.000000000 + x = -2.386303511 + 1.833333334 x = -2.386303511 + 1.833333334 Combine like terms: -2.386303511 + 1.833333334 = -0.552970177 x = -0.552970177 Simplifying x = -0.552970177

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.219636845, -0.552970177}

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