Question

@Mathematics What is the range of f(x) = -x2 + 4 if the domain is {2,0,1}?
A){0,4,3}
B){0,4,5}
C){8,4,3}
D){8,4,5}

Answer 1

i'm assuming ur ques is f(x)=-x^2+4
put x=2 you get f(x)=-2^2+2=0
put x=0 f(x)=4
put x=1 f(x)=-1+4=3
so range is 0,4,3
option a

Answer 2

Make a little table:

f(x) = -x^2 + 4
and
x = 2, 0 , 1

Now find f(2) , f(0), f(1).
"f evaluated at x = 2" , "f evaluated at x = 0" etc.