Question

If f(x) = 6x – 4, what is f(x) when x = 8?

Answer 1

f(8) = 44

Explanation:

`f(x)=6x-4\\\\\text{Put x = 8 to the equation:}\\\\f(8)=6(8)-4=48-4=44`

Answer 2

Use the substitution method

f(x)= 6x-4

f(8)= 6(8)-4

f(8)= 48-4

f(8)= 44

Answer is f(8)= 44