Question

find the value of x that - 7 /11 ^ - 3 *-7 /11 ^ 5 X is equal to -7/11to the power - 2 into - 1

Answer 1

X 11 X 13+13

=13 X 7 X 11 +13 X 1

=13(7 X 11+1)

=13k where k belongs to N(the set of natural nos. )

Similarly you can do the other one by taking out 5 as common.

In either cases you notice that the number has a factor other than 1 and the number itself (13k and 5k) .So,the numbers are definitely composite.