I am not sure what this is asking for, can someone help me please?! Thank you!
Okay this is my back to school review on khan academy, I solved the problem, easy as pie, I got x^2-81 , but what on earth is it asking for in the other part? I will put a screenshot in the comments, thank you!

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first expand (x - 9)(x + 9)
then compare it term by term with
x^2 + rx + t

I know that, but x^2-81 does not match terms???

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