<prompt> Rahisisha yafuatayo: 2y-1cdot4y102y94y82y7. Eleza jibu lako kama polynomial na digrii za masharti kwa kupungua kwa mpangilio.  <response>: Tunasambaza na kurahisisha: anzaalign 2y-1cdot4y102y94y82y7 2ycdot4y102y94y82y7-4y102y94y82y7 miaka 8114y108y94y8-4y10-2y9-4y8-2y7.endalignTumebakiwa na 8y116y9-2y7. 