To help you out I save your picture and explain the process. The only thing tht confuses me is problem #!6. But I hope I helped you out in the slightest bit
The sum of two trinomials ________.
2 answers:
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Hello here is a solution :
The answer is D. In the function 
, A value of 5 would make the denominator 0. This is undefined, so 5 is excluded.