Giải các PT sau (Đặt ẩn phụ)
a,\(\left(x^2+x\right)^2+4\left(x^2+x\right)-12=0\)
b,\(\left(x^2+2x+3\right)^2-9\left(x^2+2x+3\right)+18=0\)
c,\(\left(x-2\right)\left(x+2\right)\left(x^2-10\right)=72\)
d,\(x\left(x+1\right)\left(x^2+x+1\right)=42\)
e,\(\left(x-1\right)\left(x-3\right)\left(x+5\right)\left(x+7\right)-297=0\)
f,\(x^4-2x^2-144x-1295=0\)