Step-by-step explanation:
Another view, so to speak might be as follows. The vital points of y=x4–1y=x4–1 are too much the same to see what is happening , so instead, we examine y=x433x2−4y=x433x2−4 which factors as y=(x2–1)(x2+4)y=(x2–1)(x2+4). In the following, all the roots are visible if we alter the name one axis. Good Luck.
