21t^2+t-2=0

Solution for 21t^2+t-2=0 equation:

Simplifying
21t2 + t + -2 = 0

Reorder the terms:
-2 + t + 21t2 = 0

Solving
-2 + t + 21t2 = 0

Solving for variable 't'.

Factor a trinomial.
(-1 + -3t)(2 + -7t) = 0

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

Simplifying
-1 + -3t = 0

Solving
-1 + -3t = 0

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

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

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

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

Divide each side by '-3'.
t = -0.3333333333

Simplifying
t = -0.3333333333
Subproblem 2
Set the factor '(2 + -7t)' equal to zero and attempt to solve:

Simplifying
2 + -7t = 0

Solving
2 + -7t = 0

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

Add '-2' to each side of the equation.
2 + -2 + -7t = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -7t = 0 + -2
-7t = 0 + -2

Combine like terms: 0 + -2 = -2
-7t = -2

Divide each side by '-7'.
t = 0.2857142857

Simplifying
t = 0.2857142857
Solution
t = {-0.3333333333, 0.2857142857}