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.

$f_1$ = { (1, -1), (4, 2), (9, -3), (16, -4) }

Answer 1

Since every element of $A$ have a unique image in $B$ therefore $f_1$ is a function.

Range of $f_1=${$-1,2,-3,-4$}