Polynomial equation question(screenshot included)

So, to find our x-intercepts, y must be zero

ANSWER: (0,0) (-5.0) (9,0) are your x-intercepts

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?