Final answer:
To factor the expression 4x + 32, divide each term by 4, which gives you 4(x + 8).
Step-by-step explanation:
To factor the expression 4x + 32, we can find the greatest common factor (GCF) of the two terms. The GCF of 4 and 32 is 4. We can then divide each term by 4 to factor out 4:
4x + 32 = 4(x + 8)
Therefore, the correct answer is a) 4(x + 8).