For this case we have the following factorized expression:
[tex](2y-9) (2y-9)[/tex]
Applying distributive property we have:
[tex](2y) (2y) - (2y) (9) - (9) (2y) + (9) (9) =\\4y ^ 2-18y-18y + 81 =[/tex]
We add similar terms taking into account that: Equal signs are added and the same sign is placed.
[tex]4y ^ 2-36y + 81[/tex]
ANswer:
[tex]4y ^ 2-36y + 81[/tex]