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Answer:
In Standard form it is -2y^4 + y^3 + 7y^2 + 5y + 15.
Degree 4.
Step-by-step explanation:
y³+2y(y-y³)+5y²+5y+15
= y^3 + 2y^2 - 2y^4 + 5y^2 + 5y + 15
= -2y^4 + y^3 + 7y^2 + 5y + 15