SOLUTION
From the image given,
[tex]\begin{gathered} j^2+a^2+y^2+2aj+2ay+2jy \\ is\text{ a polynomial } \end{gathered}[/tex]
why
[tex]\begin{gathered} (j+a+y)^2 \\ is\text{ a trinomial } \end{gathered}[/tex]
Now,
[tex]\begin{gathered} j^2+a^2+y^2+2aj+2ay+2jy \\ is\text{ a polynomial which is a square of a trinomial } \\ (j+a+y)^2 \end{gathered}[/tex]
Hence, the correct answer is option f
Polynomial which is a square of a trinomial
