Answer
$f(x)=x (x+3)(x-4)$
Work Step by Step
Here, we have $f(x)=a (x+3)(x)(x-4)$
When $x=-1$, then we have $10=a (-1+3)(-1)(-1-4)$
or, $10a=10$
This gives: $a=1$
Thus, we have $f(x)=x (x+3)(x-4)$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.