3x^2+20x-6=0

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Solution for 3x^2+20x-6=0 equation:


Simplifying
3x2 + 20x + -6 = 0

Reorder the terms:
-6 + 20x + 3x2 = 0

Solving
-6 + 20x + 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 + 6.666666667x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 6.666666667x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 6.666666667x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 6.666666667x + x2 = 0 + 2
6.666666667x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
6.666666667x + x2 = 2

The x term is 6.666666667x.  Take half its coefficient (3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
6.666666667x + 11.11111112 + x2 = 2 + 11.11111112

Reorder the terms:
11.11111112 + 6.666666667x + x2 = 2 + 11.11111112

Combine like terms: 2 + 11.11111112 = 13.11111112
11.11111112 + 6.666666667x + x2 = 13.11111112

Factor a perfect square on the left side:
(x + 3.333333334)(x + 3.333333334) = 13.11111112

Calculate the square root of the right side: 3.620926832

Break this problem into two subproblems by setting 
(x + 3.333333334) equal to 3.620926832 and -3.620926832.

Subproblem 1

x + 3.333333334 = 3.620926832 Simplifying x + 3.333333334 = 3.620926832 Reorder the terms: 3.333333334 + x = 3.620926832 Solving 3.333333334 + x = 3.620926832 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = 3.620926832 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = 3.620926832 + -3.333333334 x = 3.620926832 + -3.333333334 Combine like terms: 3.620926832 + -3.333333334 = 0.287593498 x = 0.287593498 Simplifying x = 0.287593498

Subproblem 2

x + 3.333333334 = -3.620926832 Simplifying x + 3.333333334 = -3.620926832 Reorder the terms: 3.333333334 + x = -3.620926832 Solving 3.333333334 + x = -3.620926832 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.333333334' to each side of the equation. 3.333333334 + -3.333333334 + x = -3.620926832 + -3.333333334 Combine like terms: 3.333333334 + -3.333333334 = 0.000000000 0.000000000 + x = -3.620926832 + -3.333333334 x = -3.620926832 + -3.333333334 Combine like terms: -3.620926832 + -3.333333334 = -6.954260166 x = -6.954260166 Simplifying x = -6.954260166

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.287593498, -6.954260166}

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