3x^2-16x-12=6

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Solution for 3x^2-16x-12=6 equation:


Simplifying
3x2 + -16x + -12 = 6

Reorder the terms:
-12 + -16x + 3x2 = 6

Solving
-12 + -16x + 3x2 = 6

Solving for variable 'x'.

Reorder the terms:
-12 + -6 + -16x + 3x2 = 6 + -6

Combine like terms: -12 + -6 = -18
-18 + -16x + 3x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-18 + -16x + 3x2 = 0

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

Divide each side by '3'.
-6 + -5.333333333x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -5.333333333x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -5.333333333x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -5.333333333x + x2 = 0 + 6
-5.333333333x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-5.333333333x + x2 = 6

The x term is -5.333333333x.  Take half its coefficient (-2.666666667).
Square it (7.111111113) and add it to both sides.

Add '7.111111113' to each side of the equation.
-5.333333333x + 7.111111113 + x2 = 6 + 7.111111113

Reorder the terms:
7.111111113 + -5.333333333x + x2 = 6 + 7.111111113

Combine like terms: 6 + 7.111111113 = 13.111111113
7.111111113 + -5.333333333x + x2 = 13.111111113

Factor a perfect square on the left side:
(x + -2.666666667)(x + -2.666666667) = 13.111111113

Calculate the square root of the right side: 3.620926831

Break this problem into two subproblems by setting 
(x + -2.666666667) equal to 3.620926831 and -3.620926831.

Subproblem 1

x + -2.666666667 = 3.620926831 Simplifying x + -2.666666667 = 3.620926831 Reorder the terms: -2.666666667 + x = 3.620926831 Solving -2.666666667 + x = 3.620926831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.666666667' to each side of the equation. -2.666666667 + 2.666666667 + x = 3.620926831 + 2.666666667 Combine like terms: -2.666666667 + 2.666666667 = 0.000000000 0.000000000 + x = 3.620926831 + 2.666666667 x = 3.620926831 + 2.666666667 Combine like terms: 3.620926831 + 2.666666667 = 6.287593498 x = 6.287593498 Simplifying x = 6.287593498

Subproblem 2

x + -2.666666667 = -3.620926831 Simplifying x + -2.666666667 = -3.620926831 Reorder the terms: -2.666666667 + x = -3.620926831 Solving -2.666666667 + x = -3.620926831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.666666667' to each side of the equation. -2.666666667 + 2.666666667 + x = -3.620926831 + 2.666666667 Combine like terms: -2.666666667 + 2.666666667 = 0.000000000 0.000000000 + x = -3.620926831 + 2.666666667 x = -3.620926831 + 2.666666667 Combine like terms: -3.620926831 + 2.666666667 = -0.954260164 x = -0.954260164 Simplifying x = -0.954260164

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.287593498, -0.954260164}

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