0=8x^2-12x-3

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Solution for 0=8x^2-12x-3 equation:


Simplifying
0 = 8x2 + -12x + -3

Reorder the terms:
0 = -3 + -12x + 8x2

Solving
0 = -3 + -12x + 8x2

Solving for variable 'x'.

Combine like terms: 0 + 3 = 3
3 + 12x + -8x2 = -3 + -12x + 8x2 + 3 + 12x + -8x2

Reorder the terms:
3 + 12x + -8x2 = -3 + 3 + -12x + 12x + 8x2 + -8x2

Combine like terms: -3 + 3 = 0
3 + 12x + -8x2 = 0 + -12x + 12x + 8x2 + -8x2
3 + 12x + -8x2 = -12x + 12x + 8x2 + -8x2

Combine like terms: -12x + 12x = 0
3 + 12x + -8x2 = 0 + 8x2 + -8x2
3 + 12x + -8x2 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
3 + 12x + -8x2 = 0

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-0.375 + -1.5x + x2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + -1.5x + 0.375 + x2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + -1.5x + x2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + -1.5x + x2 = 0 + 0.375
-1.5x + x2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
-1.5x + x2 = 0.375

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 0.375 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 0.375 + 0.5625

Combine like terms: 0.375 + 0.5625 = 0.9375
0.5625 + -1.5x + x2 = 0.9375

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 0.9375

Calculate the square root of the right side: 0.968245837

Break this problem into two subproblems by setting 
(x + -0.75) equal to 0.968245837 and -0.968245837.

Subproblem 1

x + -0.75 = 0.968245837 Simplifying x + -0.75 = 0.968245837 Reorder the terms: -0.75 + x = 0.968245837 Solving -0.75 + x = 0.968245837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 0.968245837 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 0.968245837 + 0.75 x = 0.968245837 + 0.75 Combine like terms: 0.968245837 + 0.75 = 1.718245837 x = 1.718245837 Simplifying x = 1.718245837

Subproblem 2

x + -0.75 = -0.968245837 Simplifying x + -0.75 = -0.968245837 Reorder the terms: -0.75 + x = -0.968245837 Solving -0.75 + x = -0.968245837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -0.968245837 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -0.968245837 + 0.75 x = -0.968245837 + 0.75 Combine like terms: -0.968245837 + 0.75 = -0.218245837 x = -0.218245837 Simplifying x = -0.218245837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.718245837, -0.218245837}

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