Question

(y^2-2y)^2-y^2(y+3)(y-3)+2y(2y^2+5)

Answer 1

(y^2-2y)^2-y^2(y+3)(y-3)+2y(2y^2+5)=у^4-4у^3+4у^2-у^2(у^2-9)+4у^3+10у=у^4-4у^3+4у^2-у^4+9у^2+4у^3+10у=13у^2+10у=у(13у+10)