5a^2+22a+21=0

Solution for 5a^2+22a+21=0 equation:

Simplifying
5a2 + 22a + 21 = 0

Reorder the terms:
21 + 22a + 5a2 = 0

Solving
21 + 22a + 5a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(3 + a)(7 + 5a) = 0

Subproblem 1
Set the factor '(3 + a)' equal to zero and attempt to solve:

Simplifying
3 + a = 0

Solving
3 + a = 0

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

Add '-3' to each side of the equation.
3 + -3 + a = 0 + -3

Combine like terms: 3 + -3 = 0
0 + a = 0 + -3
a = 0 + -3

Combine like terms: 0 + -3 = -3
a = -3

Simplifying
a = -3
Subproblem 2
Set the factor '(7 + 5a)' equal to zero and attempt to solve:

Simplifying
7 + 5a = 0

Solving
7 + 5a = 0

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

Add '-7' to each side of the equation.
7 + -7 + 5a = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 5a = 0 + -7
5a = 0 + -7

Combine like terms: 0 + -7 = -7
5a = -7

Divide each side by '5'.
a = -1.4

Simplifying
a = -1.4
Solution
a = {-3, -1.4}