6x^2+3x-8=0

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Solution for 6x^2+3x-8=0 equation:


Simplifying
6x2 + 3x + -8 = 0

Reorder the terms:
-8 + 3x + 6x2 = 0

Solving
-8 + 3x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-1.333333333 + 0.5x + x2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + 0.5x + 1.333333333 + x2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + 0.5x + x2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + 0.5x + x2 = 0 + 1.333333333
0.5x + x2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
0.5x + x2 = 1.333333333

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 1.333333333 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 1.333333333 + 0.0625

Combine like terms: 1.333333333 + 0.0625 = 1.395833333
0.0625 + 0.5x + x2 = 1.395833333

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 1.395833333

Calculate the square root of the right side: 1.181453906

Break this problem into two subproblems by setting 
(x + 0.25) equal to 1.181453906 and -1.181453906.

Subproblem 1

x + 0.25 = 1.181453906 Simplifying x + 0.25 = 1.181453906 Reorder the terms: 0.25 + x = 1.181453906 Solving 0.25 + x = 1.181453906 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 1.181453906 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 1.181453906 + -0.25 x = 1.181453906 + -0.25 Combine like terms: 1.181453906 + -0.25 = 0.931453906 x = 0.931453906 Simplifying x = 0.931453906

Subproblem 2

x + 0.25 = -1.181453906 Simplifying x + 0.25 = -1.181453906 Reorder the terms: 0.25 + x = -1.181453906 Solving 0.25 + x = -1.181453906 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -1.181453906 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -1.181453906 + -0.25 x = -1.181453906 + -0.25 Combine like terms: -1.181453906 + -0.25 = -1.431453906 x = -1.431453906 Simplifying x = -1.431453906

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.931453906, -1.431453906}

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