Answer :
Evaluating a function
We want to know if
f(x) = x² +5
is a possible function.
If it is it should satisfy that f(8)= 66, it is to say that when we replace x = 8 the answer should be 66.
Let's replace x by 8
f(x) = x² +5
f(8) = 8² +5
f(8) = 64 +5
f(8) = 69 66≠