Answer
The solution is between 4 and 5.
Work Step by Step
We plug in values until we arrive at the correct answer.
$\underline b\ \ \ \ \underline{-115b+80}$
$3\ \ \ \ -265$
$4\ \ \ \ -380_\longrightarrow$ the solution is between 4 and 5
$5\ \ \ \ -495$
