Let there be a function [[$ f(x) = 3x - 4 $]]. Calculate

a) [[$ f(-2) $]].



Answer: [[$ f(-2) = $]]

b) [[$ f(a) $]].



Answer: [[$ f(a) = $]]

c) [[$ f(b + 3) $]].



Answer: [[$ f(b + 3) = $]]

d) [[$ f(1) - f(-5) $]].



Answer: [[$ f(1) - f(-5) = $]]