To factor out the greatest common factor (GCF) from the expression \(21p^6 + 30p^2 + 27\), we need to identify the largest number that divides all the coefficients (21, 30, and 27) and the smallest power of \(p\) that is common to all terms.
Step 1: Identify the Greatest Common Factor (GCF)
To factor the expression \(21p^6 + 30p^2 + 27\), we first identify the greatest common factor (GCF) of the coefficients 21, 30, and 27. The GCF of these numbers is 3.
Step 2: Factor Out the GCF
Next, we factor out the GCF from each term in the expression:
\[
21p^6 + 30p^2 + 27 = 3(7p^6) + 3(10p^2) + 3(9)
\]
Step 3: Simplify the Expression
After factoring out the GCF, we simplify the expression inside the parentheses:
\[
3(7p^6 + 10p^2 + 9)
\]
Final Answer
The factored form of the expression \(21p^6 + 30p^2 + 27\) is:
\[
\boxed{3(7p^6 + 10p^2 + 9)}
\]