Question

me podrían ayudar por favor!!
$(m ^{2} \ + 4) ( - m ^{3} + 4) =$
$(36a ^{2} + 2 )( - 12a ^{2} + 3) =$
$(15a ^{3}+ 4)(16 a^{3} - 2) =$
$(m ^{2} + 7)( - m3 + 2) =$

Answer 1

(m²+4)(-m³+4)=(-m⁵+4m²-4m³+16)=-m⁵-4m³+4m²+16(36a²+2)(-12a²+3)=(-432a⁴+108a²-24a²+6)=(-432a⁴+84a²+6)(15a³+4)(16a³-2)=(240a³-30a³+64a³-8)=274a³-8(m²+7)(-m³+2)= -m⁵-7m³+2m²+14