4a^2+21a+27=0

Solution for 4a^2+21a+27=0 equation:

Simplifying
4a2 + 21a + 27 = 0

Reorder the terms:
27 + 21a + 4a2 = 0

Solving
27 + 21a + 4a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(3 + a)(9 + 4a) = 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 '(9 + 4a)' equal to zero and attempt to solve:

Simplifying
9 + 4a = 0

Solving
9 + 4a = 0

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

Add '-9' to each side of the equation.
9 + -9 + 4a = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 4a = 0 + -9
4a = 0 + -9

Combine like terms: 0 + -9 = -9
4a = -9

Divide each side by '4'.
a = -2.25

Simplifying
a = -2.25
Solution
a = {-3, -2.25}