8x^2-3x-12=0

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


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

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

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

Solving for variable 'x'.

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

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

Move the constant term to the right:

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

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

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -0.375x + x2 = 0 + 1.5
-0.375x + x2 = 0 + 1.5

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

The x term is -0.375x.  Take half its coefficient (-0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
-0.375x + 0.03515625 + x2 = 1.5 + 0.03515625

Reorder the terms:
0.03515625 + -0.375x + x2 = 1.5 + 0.03515625

Combine like terms: 1.5 + 0.03515625 = 1.53515625
0.03515625 + -0.375x + x2 = 1.53515625

Factor a perfect square on the left side:
(x + -0.1875)(x + -0.1875) = 1.53515625

Calculate the square root of the right side: 1.239014225

Break this problem into two subproblems by setting 
(x + -0.1875) equal to 1.239014225 and -1.239014225.

Subproblem 1

x + -0.1875 = 1.239014225 Simplifying x + -0.1875 = 1.239014225 Reorder the terms: -0.1875 + x = 1.239014225 Solving -0.1875 + x = 1.239014225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = 1.239014225 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = 1.239014225 + 0.1875 x = 1.239014225 + 0.1875 Combine like terms: 1.239014225 + 0.1875 = 1.426514225 x = 1.426514225 Simplifying x = 1.426514225

Subproblem 2

x + -0.1875 = -1.239014225 Simplifying x + -0.1875 = -1.239014225 Reorder the terms: -0.1875 + x = -1.239014225 Solving -0.1875 + x = -1.239014225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = -1.239014225 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = -1.239014225 + 0.1875 x = -1.239014225 + 0.1875 Combine like terms: -1.239014225 + 0.1875 = -1.051514225 x = -1.051514225 Simplifying x = -1.051514225

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.426514225, -1.051514225}

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