Question

let f(x)=2x-1
f(2) equivalent ?​

Answer 1

$f(x) \: = 2x - 1 \\ \\ = > f(2) = 2 \times 2 - 1 \\ \\ = 4 - 1 \\ \\ = 3.$

Answer 2

f(x) = 2x - 1
f(2) = 2(2) - 1
f(2) = 4 - 1
f(2) = 3

Hope it helps you