Hi,

In this practice problem, only A was marked correct.

If I divide option C by z, it reduces to z^2 <= 1. So I marked A and C both correct.

Can someone please let me know where am I making a mistake?

We do not know whether the variable Z is positive or negative, so by dividing both sides by Z the inequality sign might change if it were negative.

For why C is incorrect, lets take z= -0.5. Then z^3 will be equal to -0.125, and here Z^3 > Z

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got it, thanks