Question

If A={1,4,8,9} and B={1, 2, -1, -2, -3, 3,5} and R is a relation from set A to set B {(x, y): x=y^2}. Find domain of the relation.

(a) {1,4,9}

(b) {-1,1, -2,2, -3,3}

(c) {1,4,8,9}

(d) {-1,1, -2,2, -3,3,5}

I have been asked this question during an online exam.

My query is from Relations topic in section Relations and Functions of Mathematics – Class 11

Answer 1

Right answer is (c) {1,4,8,9}

The best I can explain: We know, domain of a relation is the set from which relation is defined i.e. set A.

So, domain = {1,4,8,9}.