Question

multiply the sum of 6/7 and -13/21 by their diffrence​

Answer 1

Answer:

 155/441

Step-by-step explanation:

 Sum of these two numbers = 5/21

 Diffrence of these two numbers = 31/21

 multiply the sum of these two number and by their diffrence​ = 5/21*31/21

                                                                                                        = 155/441

Answer 2

Answer:

Sum of 6/7 and -13/21 is -

   6/7 + (-13/21)

=  6/7-13/21

= (18-13)/21

= 5/21.

Difference​ of 6/7 and -13/21 is -    

   6/7 - (-13/21)

=  6/7+13/21

=  (18+13)/21

= 31/21.

                                                    OR

Difference​ of 6/7 and -13/21 is -

=  -13/21 - 6/7

=  (-13-18)/21

= -31/21.

Here , we had done subtraction two times because we had not given that from which fraction we have to subtract other fraction.

So there will be 2 answers of this question.                                              

Step-by-step explanation:

Multiplication of 5/21 and 31/21 is -

  5/21 * 31/21

= 155/441.

                                                    OR

Multiplication of 5/21 and -31/21 is -

   5/21 * -31/21

= -155/441.

I HOPE THIS HELPS U.