It would help if you proofread your questions before you post them. A negative times a negative = positive.
5x^17 - 20x^8 - 5x^9 + 20
Having problems with the FOIL for the problem below
(5x^8-5)(x^9-4).
My answer is 5x^17-20x-5^9-20. please let me know if this is correct. if not correct can you show me what i need to do?
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