What is y^2-81?

Question

This is confusing me.

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Answer 1 · 2018-05-03T21:37:57

Guessing that's a factorization question.
#(y+9)(y-9)#

There's not really an answer as this is an expression.
It looks like you'd want to factor it so if that's the case:

#(y+9)(y-9)#