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He has to use the foil method to combine the terms. But before that it would be best if he got rid of the negative exponents by taking the inverse of the number which moves the negative exponent to the denominator making it positive and leaving a 1 in the numerator.

Step-by-step explanation:

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.