3x^2+8x=6

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Solution for 3x^2+8x=6 equation:


Simplifying
3x2 + 8x = 6

Reorder the terms:
8x + 3x2 = 6

Solving
8x + 3x2 = 6

Solving for variable 'x'.

Reorder the terms:
-6 + 8x + 3x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-6 + 8x + 3x2 = 0

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

Divide each side by '3'.
-2 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 2.666666667x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 2.666666667x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 2.666666667x + x2 = 0 + 2
2.666666667x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
2.666666667x + x2 = 2

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 2 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 2 + 1.777777780

Combine like terms: 2 + 1.777777780 = 3.77777778
1.777777780 + 2.666666667x + x2 = 3.77777778

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 3.77777778

Calculate the square root of the right side: 1.943650632

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 1.943650632 and -1.943650632.

Subproblem 1

x + 1.333333334 = 1.943650632 Simplifying x + 1.333333334 = 1.943650632 Reorder the terms: 1.333333334 + x = 1.943650632 Solving 1.333333334 + x = 1.943650632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 1.943650632 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 1.943650632 + -1.333333334 x = 1.943650632 + -1.333333334 Combine like terms: 1.943650632 + -1.333333334 = 0.610317298 x = 0.610317298 Simplifying x = 0.610317298

Subproblem 2

x + 1.333333334 = -1.943650632 Simplifying x + 1.333333334 = -1.943650632 Reorder the terms: 1.333333334 + x = -1.943650632 Solving 1.333333334 + x = -1.943650632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -1.943650632 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -1.943650632 + -1.333333334 x = -1.943650632 + -1.333333334 Combine like terms: -1.943650632 + -1.333333334 = -3.276983966 x = -3.276983966 Simplifying x = -3.276983966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.610317298, -3.276983966}

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