Let R = {(x, x 2 ) : x is a prime number less than 10}. (i) Write R in roster form. (ii) Find dom (R) and range (R).

Question

Philoid · Accepted Answer

i) {(x, x²) : x is a prime number less than 10}.

Roster form: R = {(1, 1), (2, 4), (3, 9), (5, 25), (7, 49)}

ii) The domain of R is the set of first co-ordinates of R

Dom(R) = {1, 2, 3, 5, 7}

The range of R is the set of second co-ordinates of R

Range(R) = {1, 4, 9, 25, 49}