9a^4+3a^3-21a=

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Solution for 9a^4+3a^3-21a= equation: 


Simplifying
9a4 + 3a3 + -21a = 0

Reorder the terms:
-21a + 3a3 + 9a4 = 0

Solving
-21a + 3a3 + 9a4 = 0

Solving for variable 'a'.

Factor out the Greatest Common Factor (GCF), '3a'.
3a(-7 + a2 + 3a3) = 0

Ignore the factor 3.

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 '(-7 + a2 + 3a3)' equal to zero and attempt to solve:

Simplifying
-7 + a2 + 3a3 = 0

Solving
-7 + a2 + 3a3 = 0

The solution to this equation could not be determined.

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

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