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How to find no.of. real solutions of a polynomial with nth degree?

How to find no.of. real solutions of a polynomial with nth degree?
 

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Deepak Kumar Shringi
askIITians Faculty 4404 Points
5 years ago
f(0)=-560
f’(x)=7x6+14x4+48x2+30 >0 so here f’(x)>0 this is an increasing fuynction thaty will become zero at some point that is more than zero
so there will be only one real solution here

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