Solve 64x^3 +1 =0
the back of the texts books gives me the answers -1/4 and 1 plus or minus i√3 all over 8
i understand where the -1/4 comes from . i just don't understand the second answer. i know they used the quadratic formula to get it but i always end up with something to totally different

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=4 and bc=3, find ah, ch and bh.

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Choose the linear inequality that describes the graph. the gray area represents the shaded region. a: y ≤ –4x – 2 b: y > –4x – 2 c: y ≥ –4x – 2 d: y < 4x – 2