Shana used a table to multiply the polynomials 2x + y and 5x – y + 3. Her work is shown below.
A 3-column table with 2 rows. The first column is labeled 5 x with entries 10 x squared, 5 x y. The second column is labeled negative y with entries negative 2 y, negative y squared. The third column is labeled 3 with entries 6 x, 3 y. The first row is labeled 2 x and the second row is labeled y.
Muriel told Shana that one of the products in the table was incorrect.
Which value in the table is incorrect?
What is the value Shana should have written?