find the GCF

15x^4 and 35x^2
27y^3z and 45x^2y
-8d^3 and 14d^4

The greatest common factor (GCF) of:

1. 15x^4 and 35x^2:
The GCF is 5x^2

2. 27y^3z and 45x^2y:
The GCF is 9y

3. -8d^3 and 14d^4:
The GCF is 2d^3