Question

If f(x) = 2x - 5, then f(4) is

Answer 1

f(4)=2(4)-5=3

Answer 2

Answer:

you must to replace x be 4.

like this f(4)=2(4)-5

so 2×4 = 8

and then 8-5=3

so the final answer is f(4)=3