limx→−128x3+12x+1
It is of the form 00
=limx→−128(x3+18)2(x+12)
=82limx→−12(x3+(12)3)x+12
=4limx→−12(x+12)(x2+12−14x)(x+12)
=4limx→−12(x2−12x+14)
=4((−12)2+14−12(−12))
=4(14+14+24)
=3