0=3x^2-16x-9

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Solution for 0=3x^2-16x-9 equation:


Simplifying
0 = 3x2 + -16x + -9

Reorder the terms:
0 = -9 + -16x + 3x2

Solving
0 = -9 + -16x + 3x2

Solving for variable 'x'.

Combine like terms: 0 + 9 = 9
9 + 16x + -3x2 = -9 + -16x + 3x2 + 9 + 16x + -3x2

Reorder the terms:
9 + 16x + -3x2 = -9 + 9 + -16x + 16x + 3x2 + -3x2

Combine like terms: -9 + 9 = 0
9 + 16x + -3x2 = 0 + -16x + 16x + 3x2 + -3x2
9 + 16x + -3x2 = -16x + 16x + 3x2 + -3x2

Combine like terms: -16x + 16x = 0
9 + 16x + -3x2 = 0 + 3x2 + -3x2
9 + 16x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
9 + 16x + -3x2 = 0

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

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

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -5.333333333x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -5.333333333x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -5.333333333x + x2 = 0 + 3
-5.333333333x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-5.333333333x + x2 = 3

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 = 3 + 7.111111113

Reorder the terms:
7.111111113 + -5.333333333x + x2 = 3 + 7.111111113

Combine like terms: 3 + 7.111111113 = 10.111111113
7.111111113 + -5.333333333x + x2 = 10.111111113

Factor a perfect square on the left side:
(x + -2.666666667)(x + -2.666666667) = 10.111111113

Calculate the square root of the right side: 3.179797338

Break this problem into two subproblems by setting 
(x + -2.666666667) equal to 3.179797338 and -3.179797338.

Subproblem 1

x + -2.666666667 = 3.179797338 Simplifying x + -2.666666667 = 3.179797338 Reorder the terms: -2.666666667 + x = 3.179797338 Solving -2.666666667 + x = 3.179797338 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 = 3.179797338 + 2.666666667 Combine like terms: -2.666666667 + 2.666666667 = 0.000000000 0.000000000 + x = 3.179797338 + 2.666666667 x = 3.179797338 + 2.666666667 Combine like terms: 3.179797338 + 2.666666667 = 5.846464005 x = 5.846464005 Simplifying x = 5.846464005

Subproblem 2

x + -2.666666667 = -3.179797338 Simplifying x + -2.666666667 = -3.179797338 Reorder the terms: -2.666666667 + x = -3.179797338 Solving -2.666666667 + x = -3.179797338 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 = -3.179797338 + 2.666666667 Combine like terms: -2.666666667 + 2.666666667 = 0.000000000 0.000000000 + x = -3.179797338 + 2.666666667 x = -3.179797338 + 2.666666667 Combine like terms: -3.179797338 + 2.666666667 = -0.513130671 x = -0.513130671 Simplifying x = -0.513130671

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.846464005, -0.513130671}

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