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Answer:
f(a+2) = (3a^2 +27a +46)/(a+2)
Explanation:
Put (a+2) where x is and simplify.
f(a+2) = 3((a+2) +5) +4/(a+2)
f(a+2) = 3(a +7) +4/(a+2)
f(a+2) = 3a +21 +4/(a+2)
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We can combine the terms to a single rational expression.
f(a+2) = ((3a +21)(a +2) +4)/(a+2) = (3a^2 +27a +42 +4)/(a+2)
f(a+2) = (3a^2 +27a +46)/(a+2)