Put x very large. Then
you get x^4/x^3= x
When x is very small retain only x terms.
= -10/(2x)
For any value of x smaller than 1, the right hand side si always negative. Therefore x>.
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Put x very large. Then
you get x^4/x^3= x
When x is very small retain only x terms.
= -10/(2x)
For any value of x smaller than 1, the right hand side si always negative. Therefore x>.