Question

What is the difference between the highest positive factor of 19 and the highest negative factor of 21?

Answer 1

19 is prime number ( divisible only by 1 and with itself )

Positive factors of 19:

1 and 19

Negative Factors of 19:

- 1 and - 19

Highest positive factor of 19 is 19

Positive factors of 21:

1 , 3 , 7 and 21

Negative Factors of 21:

- 1 , - 3 , - 7 and - 21

The highest negative factor of 21 is - 1 because, for negative numbes
- 1 > - 21

The difference between the highest positive factor of 19 and the highest negative factor of 21 =

19 - ( - 1 ) = 19 + 1 = 20

Answer 2

20