20a^3+5a=

Solution for 20a^3+5a= equation:

Simplifying
20a3 + 5a = 0

Reorder the terms:
5a + 20a3 = 0

Solving
5a + 20a3 = 0

Solving for variable 'a'.

Factor out the Greatest Common Factor (GCF), '5a'.
5a(1 + 4a2) = 0

Ignore the factor 5.
Subproblem 1
Set the factor 'a' equal to zero and attempt to solve:

Simplifying
a = 0

Solving
a = 0

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

Simplifying
a = 0
Subproblem 2
Set the factor '(1 + 4a2)' equal to zero and attempt to solve:

Simplifying
1 + 4a2 = 0

Solving
1 + 4a2 = 0

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

Add '-1' to each side of the equation.
1 + -1 + 4a2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 4a2 = 0 + -1
4a2 = 0 + -1

Combine like terms: 0 + -1 = -1
4a2 = -1

Divide each side by '4'.
a2 = -0.25

Simplifying
a2 = -0.25

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.
Solution
a = {0}