Question

Упростите ...............

Answer 1

$(t+2)(t-2)-(t+4)^2=(t^2-4)-(t^2+8t+16)=-8t-20=-4(2t+5)\\\3(t+2m)^2-12m=3(t^2+4tm+4m^2)-12, tm=3t^2+12m^2=3(t^2+4m^2)$