help help i only have 40 minutes

Fill in the blank to make equivalent rational expressions.I need this answered within 5 minutes. Thank you

Algebra question example (i already have the answer to this one.
4/x9=?/(x+6)(x+9) The question mark is where i’m trying to understand what symbol I should be using.

I’m using online calculators but i don’t know which key to use for the missing square.

 

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