How would one go about solving (n+3)(n-3)?

Question

in Geometry we're learning about quadrilaterals and my teacher gave us a bunch of these problems to do. they dont equal anything and i dont understand. please help?

Answer

You first remove the bracket by multypling
   
n(squared) -3n+3n-9
Then you must put the variables into an quadratic equation

Answer

Here answering means what and how this expression is related to the question of geometry please explain.

Answer

(n+3)(n-3) = n^2 - 9
It's not geometry. It's algebra.

How would one go about solving (n+3)(n-3)?

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