5x^2-8x-12=0

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Solution for 5x^2-8x-12=0 equation:


Simplifying
5x2 + -8x + -12 = 0

Reorder the terms:
-12 + -8x + 5x2 = 0

Solving
-12 + -8x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-2.4 + -1.6x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -1.6x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -1.6x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -1.6x + x2 = 0 + 2.4
-1.6x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-1.6x + x2 = 2.4

The x term is -1.6x.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6x + 0.64 + x2 = 2.4 + 0.64

Reorder the terms:
0.64 + -1.6x + x2 = 2.4 + 0.64

Combine like terms: 2.4 + 0.64 = 3.04
0.64 + -1.6x + x2 = 3.04

Factor a perfect square on the left side:
(x + -0.8)(x + -0.8) = 3.04

Calculate the square root of the right side: 1.743559577

Break this problem into two subproblems by setting 
(x + -0.8) equal to 1.743559577 and -1.743559577.

Subproblem 1

x + -0.8 = 1.743559577 Simplifying x + -0.8 = 1.743559577 Reorder the terms: -0.8 + x = 1.743559577 Solving -0.8 + x = 1.743559577 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = 1.743559577 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 1.743559577 + 0.8 x = 1.743559577 + 0.8 Combine like terms: 1.743559577 + 0.8 = 2.543559577 x = 2.543559577 Simplifying x = 2.543559577

Subproblem 2

x + -0.8 = -1.743559577 Simplifying x + -0.8 = -1.743559577 Reorder the terms: -0.8 + x = -1.743559577 Solving -0.8 + x = -1.743559577 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = -1.743559577 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -1.743559577 + 0.8 x = -1.743559577 + 0.8 Combine like terms: -1.743559577 + 0.8 = -0.943559577 x = -0.943559577 Simplifying x = -0.943559577

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.543559577, -0.943559577}

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