Chur best answer is gonna be B hope this helps chu
(b^2+5)(−b^2+7)
Use the FOIL METHOD to expand.
-b^4 + 7b^2 - 5b^2 + 35
-b^4 + 2b^2 + 35
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Hope you could understand.
If you have any query, feel free to ask.
hats per hour. This fraction simplified is 2 hats per hour. This is the solution. 
