Final answer:
To factor out the GCF from z(y+5)-3(y+5), we find the common factor (y+5) and rewrite the expression as (y+5)(z-3).
Step-by-step explanation:
To factor out the greatest common factor (GCF), we need to find the common factors of the terms in the expression. In this case, the GCF of z(y+5) and -3(y+5) is (y+5). We can rewrite the expression as (y+5)(z-3). The GCF is the common factor that we can divide every term in the expression by without leaving a remainder.
Learn more about Factoring polynomials