1) (4z⁶-2x³z³+x⁶)(2z³+x³)=(2z³-x³)(2z³+x³)=4z⁶-x⁶ 2) (3p-4)(9p²+12+16)=(3p-4)(3p+4)=9p²-16 3) (m-2n²)(m²+2mn²+4n⁴)=(m-2n²)(m+2n²)=m²-4n⁴ 4) (9x⁸+3x⁴y³+y⁶)(3x⁴-y³)=(3x⁴+y³)(3x⁴-y³)=9x⁸-y⁶