0=3t^2-4t-12

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Solution for 0=3t^2-4t-12 equation:


Simplifying
0 = 3t2 + -4t + -12

Reorder the terms:
0 = -12 + -4t + 3t2

Solving
0 = -12 + -4t + 3t2

Solving for variable 't'.

Combine like terms: 0 + 12 = 12
12 + 4t + -3t2 = -12 + -4t + 3t2 + 12 + 4t + -3t2

Reorder the terms:
12 + 4t + -3t2 = -12 + 12 + -4t + 4t + 3t2 + -3t2

Combine like terms: -12 + 12 = 0
12 + 4t + -3t2 = 0 + -4t + 4t + 3t2 + -3t2
12 + 4t + -3t2 = -4t + 4t + 3t2 + -3t2

Combine like terms: -4t + 4t = 0
12 + 4t + -3t2 = 0 + 3t2 + -3t2
12 + 4t + -3t2 = 3t2 + -3t2

Combine like terms: 3t2 + -3t2 = 0
12 + 4t + -3t2 = 0

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

Divide each side by '-3'.
-4 + -1.333333333t + t2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -1.333333333t + 4 + t2 = 0 + 4

Reorder the terms:
-4 + 4 + -1.333333333t + t2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1.333333333t + t2 = 0 + 4
-1.333333333t + t2 = 0 + 4

Combine like terms: 0 + 4 = 4
-1.333333333t + t2 = 4

The t term is -1.333333333t.  Take half its coefficient (-0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
-1.333333333t + 0.4444444442 + t2 = 4 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333t + t2 = 4 + 0.4444444442

Combine like terms: 4 + 0.4444444442 = 4.4444444442
0.4444444442 + -1.333333333t + t2 = 4.4444444442

Factor a perfect square on the left side:
(t + -0.6666666665)(t + -0.6666666665) = 4.4444444442

Calculate the square root of the right side: 2.108185107

Break this problem into two subproblems by setting 
(t + -0.6666666665) equal to 2.108185107 and -2.108185107.

Subproblem 1

t + -0.6666666665 = 2.108185107 Simplifying t + -0.6666666665 = 2.108185107 Reorder the terms: -0.6666666665 + t = 2.108185107 Solving -0.6666666665 + t = 2.108185107 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + t = 2.108185107 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + t = 2.108185107 + 0.6666666665 t = 2.108185107 + 0.6666666665 Combine like terms: 2.108185107 + 0.6666666665 = 2.7748517735 t = 2.7748517735 Simplifying t = 2.7748517735

Subproblem 2

t + -0.6666666665 = -2.108185107 Simplifying t + -0.6666666665 = -2.108185107 Reorder the terms: -0.6666666665 + t = -2.108185107 Solving -0.6666666665 + t = -2.108185107 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + t = -2.108185107 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + t = -2.108185107 + 0.6666666665 t = -2.108185107 + 0.6666666665 Combine like terms: -2.108185107 + 0.6666666665 = -1.4415184405 t = -1.4415184405 Simplifying t = -1.4415184405

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.7748517735, -1.4415184405}

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