Question

If f(x) = 2x+ 1, then f(3) =
i cant really seem to understand how to work it out.

Answer 1

f(3) means that x is equal to 3.

This just means we substitute the value of 3 into the f(x) = 2x+ 1 to get

f(x) = 2(3)+ 1,

f(3) = 2(3)+ 1,

f(3) = 6+ 1,

f(3) = 7

Answer 2

f(3) = 7

Explanation:

f(x) = 2x + 1

f(3) = 2(3) + 1

f(3) = 6 + 1

Substitute the 3 in for x.