а) a⁴-9b⁴ = (a²+3b²)(a²-3b²)б) y^5+y+1 = y^5+y^2+y^3+y+1 = y^2(y^3+1)+y(y^2+1)+1 = y^2(y+1)(y²-y+1)+y(y+1)+1 = (y+1)(y²-y+1)(y²+y+1)
а) a⁴-9b⁴ = (a²+3b²)(a²-3b²)
б) y^5+y+1 = y^5+y^2+y^3+y+1 = y^2(y^3+1)+y(y^2+1)+1 = y^2(y+1)(y²-y+1)+y(y+1)+1 = (y+1)(y²-y+1)(y²+y+1)