Answer
$4b^{2}-33b+8$
Work Step by Step
$(4b-1)(b-8)=$
$...$distribute the second factor, $(b-8)$.
$=4b(b-8)-1(b-8)$
...distribute $4b$.
$=4b^{2}-32b-1(b-8)$
...distribute $-1$.
$=4b^{2}-32b-b+8$
...gather like terms.
=$4b^{2}-33b+8$