![]() ![]() Because the 25 represents an amount of ones and the -2 represents an amount of "n - 1"s, they are not like terms and so cannot be added. n = 1.5 comes from inappropriately combining the 25 with the -2 after seeing the statement -11 = 25 - 2(n - 1). Any fractions/decimals or negative signs indicate an error in the setup or solving process of such a question. The solutions for "n" can ONLY be natural/counting numbers greater than or equal to 1. ![]() However, the presence of a negative sign on an answer that is supposed to be the term number of the value "-11" in this sequence should be a warning that something has gone wrong. n = 19 - n = -17 comes from mistaking the common difference as +2 (perhaps by doing the subtraction of terms in the wrong order, such as 25 - 23). ![]()
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