7t^2-7t-84=0

Solution for 7t^2-7t-84=0 equation:

Simplifying
7t2 + -7t + -84 = 0

Reorder the terms:
-84 + -7t + 7t2 = 0

Solving
-84 + -7t + 7t2 = 0

Solving for variable 't'.

Factor out the Greatest Common Factor (GCF), '7'.
7(-12 + -1t + t2) = 0

Factor a trinomial.
7((-3 + -1t)(4 + -1t)) = 0

Ignore the factor 7.
Subproblem 1
Set the factor '(-3 + -1t)' equal to zero and attempt to solve:

Simplifying
-3 + -1t = 0

Solving
-3 + -1t = 0

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

Add '3' to each side of the equation.
-3 + 3 + -1t = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1t = 0 + 3
-1t = 0 + 3

Combine like terms: 0 + 3 = 3
-1t = 3

Divide each side by '-1'.
t = -3

Simplifying
t = -3
Subproblem 2
Set the factor '(4 + -1t)' equal to zero and attempt to solve:

Simplifying
4 + -1t = 0

Solving
4 + -1t = 0

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

Add '-4' to each side of the equation.
4 + -4 + -1t = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1t = 0 + -4
-1t = 0 + -4

Combine like terms: 0 + -4 = -4
-1t = -4

Divide each side by '-1'.
t = 4

Simplifying
t = 4
Solution
t = {-3, 4}