Answer
$12n^2+13n-4$
Work Step by Step
RECALL:
The distributive property states that for any real numbers a, b, and c:
$a(b+c) = ab+ac
\\a(b-c) = ab-ac$
Use the distributive property (which is shown above) to obtain:
$=3n(4n-1) +4(4n-1)
\\=3n(4n) +3n(-1)+4(4n) +4(-1)
\\=12n^2-3n+16n-4$
Combine like terms to have:
$=12n^2+13n-4$
