Find the GCF of 8d−20

To find the greatest common factor (GCF) of the expression \( 8d - 20 \), we need to factor out the common factor from both terms.

1. Identify the coefficients: The coefficients are 8 and -20.

2. Find the GCF of the coefficients:

   • The factors of 8 are: 1, 2, 4, 8
   • The factors of 20 are: 1, 2, 4, 5, 10, 20
   • The common factors are: 1, 2, 4
   • The greatest common factor is 4.

3. Factor out the GCF:

   • Rewrite the expression by factoring out the GCF:
     \[ 8d - 20 = 4(2d - 5) \]

Thus, the GCF of the expression \( 8d - 20 \) is \( 4 \).