6t^2-30t-12=0

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Solution for 6t^2-30t-12=0 equation: 


Simplifying
6t2 + -30t + -12 = 0

Reorder the terms:
-12 + -30t + 6t2 = 0

Solving
-12 + -30t + 6t2 = 0

Solving for variable 't'.

Factor out the Greatest Common Factor (GCF), '6'.
6(-2 + -5t + t2) = 0

Ignore the factor 6.

Subproblem 1
Set the factor '(-2 + -5t + t2)' equal to zero and attempt to solve:

Simplifying
-2 + -5t + t2 = 0

Solving
-2 + -5t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -5t + 2 + t2 = 0 + 2

Reorder the terms:
-2 + 2 + -5t + t2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -5t + t2 = 0 + 2
-5t + t2 = 0 + 2

Combine like terms: 0 + 2 = 2
-5t + t2 = 2

The t term is -5t.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5t + 6.25 + t2 = 2 + 6.25

Reorder the terms:
6.25 + -5t + t2 = 2 + 6.25

Combine like terms: 2 + 6.25 = 8.25
6.25 + -5t + t2 = 8.25

Factor a perfect square on the left side:
(t + -2.5)(t + -2.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(t + -2.5) equal to 2.872281323 and -2.872281323.


Subproblem 1
t + -2.5 = 2.872281323

Simplifying
t + -2.5 = 2.872281323

Reorder the terms:
-2.5 + t = 2.872281323

Solving
-2.5 + t = 2.872281323

Solving for variable 't'.

Move all terms containing t to the left, all other terms to the right.

Add '2.5' to each side of the equation.
-2.5 + 2.5 + t = 2.872281323 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + t = 2.872281323 + 2.5
t = 2.872281323 + 2.5

Combine like terms: 2.872281323 + 2.5 = 5.372281323
t = 5.372281323

Simplifying
t = 5.372281323


Subproblem 2
t + -2.5 = -2.872281323

Simplifying
t + -2.5 = -2.872281323

Reorder the terms:
-2.5 + t = -2.872281323

Solving
-2.5 + t = -2.872281323

Solving for variable 't'.

Move all terms containing t to the left, all other terms to the right.

Add '2.5' to each side of the equation.
-2.5 + 2.5 + t = -2.872281323 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + t = -2.872281323 + 2.5
t = -2.872281323 + 2.5

Combine like terms: -2.872281323 + 2.5 = -0.372281323
t = -0.372281323

Simplifying
t = -0.372281323


Solution
The solution to the problem is based on the solutions
from the subproblems.
t = {5.372281323, -0.372281323}
Solution
t = {5.372281323, -0.372281323}

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