3x^2-5.6x-12=0

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Solution for 3x^2-5.6x-12=0 equation:


Simplifying
3x2 + -5.6x + -12 = 0

Reorder the terms:
-12 + -5.6x + 3x2 = 0

Solving
-12 + -5.6x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-4 + -1.866666667x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -1.866666667x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -1.866666667x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1.866666667x + x2 = 0 + 4
-1.866666667x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-1.866666667x + x2 = 4

The x term is -1.866666667x.  Take half its coefficient (-0.9333333335).
Square it (0.8711111114) and add it to both sides.

Add '0.8711111114' to each side of the equation.
-1.866666667x + 0.8711111114 + x2 = 4 + 0.8711111114

Reorder the terms:
0.8711111114 + -1.866666667x + x2 = 4 + 0.8711111114

Combine like terms: 4 + 0.8711111114 = 4.8711111114
0.8711111114 + -1.866666667x + x2 = 4.8711111114

Factor a perfect square on the left side:
(x + -0.9333333335)(x + -0.9333333335) = 4.8711111114

Calculate the square root of the right side: 2.207059381

Break this problem into two subproblems by setting 
(x + -0.9333333335) equal to 2.207059381 and -2.207059381.

Subproblem 1

x + -0.9333333335 = 2.207059381 Simplifying x + -0.9333333335 = 2.207059381 Reorder the terms: -0.9333333335 + x = 2.207059381 Solving -0.9333333335 + x = 2.207059381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9333333335' to each side of the equation. -0.9333333335 + 0.9333333335 + x = 2.207059381 + 0.9333333335 Combine like terms: -0.9333333335 + 0.9333333335 = 0.0000000000 0.0000000000 + x = 2.207059381 + 0.9333333335 x = 2.207059381 + 0.9333333335 Combine like terms: 2.207059381 + 0.9333333335 = 3.1403927145 x = 3.1403927145 Simplifying x = 3.1403927145

Subproblem 2

x + -0.9333333335 = -2.207059381 Simplifying x + -0.9333333335 = -2.207059381 Reorder the terms: -0.9333333335 + x = -2.207059381 Solving -0.9333333335 + x = -2.207059381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9333333335' to each side of the equation. -0.9333333335 + 0.9333333335 + x = -2.207059381 + 0.9333333335 Combine like terms: -0.9333333335 + 0.9333333335 = 0.0000000000 0.0000000000 + x = -2.207059381 + 0.9333333335 x = -2.207059381 + 0.9333333335 Combine like terms: -2.207059381 + 0.9333333335 = -1.2737260475 x = -1.2737260475 Simplifying x = -1.2737260475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.1403927145, -1.2737260475}

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