Problem

A knitting pattern for a shawl calls for 8

stitches in the first row. Each row after that

has 2 more stitches than the previous row.

The explicit rule ax = 8 + (k − 1)2 gives the

number of stitches in the nth row row.

Step-by-step explanation:

The given expression is

Where and .

The number of stitches in the n row are expressed as

Therefore, the n row has stitches.

Notice that the result is an expression, that is beacuse the problem is asking for a general solution, it's asking for the n row, which refers to certain row in general terms.