(3x-y)(9x²+y²)(3x+y)-81x⁴

Question

(3x-y)(9x²+y²)(3x+y)-81x⁴

Answer 1

(3х-у)(9х^2+у^2)(3х+у)-81х^4=(9х^2-у^2)(9х^2+у^2)-81х^2=81х^4-у^4-81х^4= - у^4

Answer 2

(3x-y)(9x²+y²)(3x+y)-81x⁴ = (9х² -у²)(9х² +у²) -81x^4 = (81x^4 - y^4) - 81 x^4 = -y^4