УПРОСТИТЕ ВЫРАЖЕНИЕ..............

Решите задачу:

$4-(2+5k^4)^2=4-(4+20k^4 +25k^8)=4-4-20k^4-25k^8=\\ =-20k^4-25k^8=-5k^4\cdot (4+5k^4) \\ \\ (6c-5)^2+60c=36c^2 -60c+25+60c=36c^2+25 \\ \\ 48y+(3y-8)^2=48y+9y^2-48y+64=9y^2+64 \\ \\ 144q^2 -(3-12q)^2 = 144q^2 -(9-72q+144q^2)=\\ = 144q^2-9+72q-144q^2=72q-9=9\cdot (8q-1) \\ \\ 112p+(8p-7)^2=112p+64p^2-112p+49=64p^2+49 \\ \\ (9d+1)^2-18d=81d^2+18d+1-18d=81d^2+1$