Question

The expression 20z−8 factored using the GCF is

Answer 1

GCF of 20 and 8 is 4

4(5z - 2)

Answer 2

`20z−8=4(5z-2)`

Explanation:

`20z−8`

20z can be written as 5 times 2 times 2 times z

8 can be written as 2 times 2 times 2

`20z-8= 5 \cdot 2 \cdot 2 \cdot z- 2 \cdot 2 \cdot 2`

Greatest common factor for 20z and 8 is 2 times 2 = 4

Now take out 4 in common

`20z−8=4(5z-2)`