Hint: step 2. You are multiplying by x^3 on both sides.
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Yaah, are you telling that its wrong method?
What do you think happens when x is negative in the original case, and after multiplying by x^3?
Whenever you are multiplying both sides, make sure that quantity you are multiplying with is always positive or else it will create complications by reversing inequality.
For example:
1 < 5
But if you multiply both side by -2, inequality reverses.
-2 > -10
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it become positive, ahhh yah i got it. Thanx man
you can write expression b as x/x^2 + 1/x^2 that simplifies to 1/x + 1/x^2 and it is easy to see that expression b is larger than a