5t^2+21t+4=0

Solution for 5t^2+21t+4=0 equation:

Simplifying
5t2 + 21t + 4 = 0

Reorder the terms:
4 + 21t + 5t2 = 0

Solving
4 + 21t + 5t2 = 0

Solving for variable 't'.

Factor a trinomial.
(4 + t)(1 + 5t) = 0

Subproblem 1
Set the factor '(4 + t)' equal to zero and attempt to solve:

Simplifying
4 + t = 0

Solving
4 + t = 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 + t = 0 + -4

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

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

Simplifying
t = -4
Subproblem 2
Set the factor '(1 + 5t)' equal to zero and attempt to solve:

Simplifying
1 + 5t = 0

Solving
1 + 5t = 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 + 5t = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 5t = 0 + -1
5t = 0 + -1

Combine like terms: 0 + -1 = -1
5t = -1

Divide each side by '5'.
t = -0.2

Simplifying
t = -0.2
Solution
t = {-4, -0.2}