Solution:
we are given that
[tex] f(x+3)=4x+12 [/tex]
we have been asked to find f(x).
we can find the value of f(x) by re-writing the given function in the form of f(x+3) and thereafter we will replace (x+3) by x.
we can re-write the given function as below
[tex] f(x+3)=4(x+3)\\\\\Rightarrow f(x)=4x\\ [/tex]
Hence the expression representing f(x) is f(x)=4x+3.
