2 , 5i

Find the common factors for the numerical part:

1,5

The factors for 1 are all numbers between 1 and 1, which divide 1 evenly.

Check numbers between 1 and 1

Find the factor pairs of 1 where x⋅y=1.

xy11

List the factors for 1.

1

1

The factors for 5 are all numbers between 1 and 5, which divide 5 evenly.

Check numbers between 1 and 5

Find the factor pairs of 5 where x⋅y=5.

xy15

List the factors for 5.

1,5

1,5

List all the factors for 1,5 to find the common factors.

1: 1

5: 1,5

The common factors for 1,5 are 1.

1

The GCF (HCF) of the numerical factors 1 is 1.

1

Find the GCF square root of 2 , 5i