Question

Prove the sum of two rational numbers is rational where a, b, c, and d are integers and b and d cannot be zero.

Answer 1

Answer:

Step-by-step explanation:

Since a,b,c and d are integers,

bd, ad and cb are also integers because product of two integers is an integer

Also, ad + cb is an integer because sum of two integers is an integer.

(ad + cb)/bd is a rational number

a/b + c/d is a rational number

Answer 2

Answer:

ad + cb / bd

Step-by-step explanation:

The answer is ad plus cb over bd

(Took test)