Question

True or false? Explain.

If f = {(1, 1), (2, 4), (3, 9)}, then f(5)=25

the answer is false (online system) but i dont know why

pls help stuck on HW

Answer 1

F should be 5 because 5 times 5 is 25 so the coordinate (x,y) should be doubling but on the third coordinate it should be 3,8 not 3,9