Question

Please Help!
Given A={-1,0,2,5,6,11},
B={-2,-1,0,18,108}
and f(x)=x^2-x-2. Is f(A)=B? Find f(A).

Answer 1

Substitute each value in A to see if its in B


f(-1) = (-1)^2 -(-1) -2
f(-1) = 0

f(0) = (0)^2 - (0) - 2
f(0) = -2

f(2) = (2)^2 - (2) - 2
= 0

etc

just repeat it for each value in A

Answer 2

plug in each value from the set of A, so f(A) and if the result is in the set of corresponding B, then f(A) = B

^^ like campbell said

Answer 3

thankyou @javawarrior and @campbell_st