Question

suppose that y=f(x) and it is true that f(8)= 66. Determine whether it is true or false that a possible function is f(x) = x² +5.

Answer 1

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≠

Then, it is not a possible function