Question

Which of the following relations are functions from A = { 1, 4, 9, 16 } to B = { -1, 2, -3, -4, 5, 6 }. In case of a function, write down its range.

$f_3$ = { (4, 2), (1, 2), (9, 2), (16, 2) }.

Answer 1

Every element of $A$ have an image in $B$ hence $f_3$ is a function.

Range of $f_3=${$2$}