Question

Given f(x)=2x+3 find f(x)=27

Answer 1

f(27) = 2(27) + 3

f(27) = 54 + 3

57

Answer 2

Use the substitution method

f(x)=2x+3

f(27)=2(27)+3

Multiply first and then add

=54+3

=57

Answer: f(27)=57