[KOUSHIK SOM]

we know that $\frac{4xy+6yz+8xz}{3}\geq (4xy\times 6yz  \times 8xz)^\frac{1}{3}$

use this as a hint....try it

[KOUSHIK SOM]

we will get back to you soon

[KOUSHIK SOM]

we will get back to you soon...........

[KOUSHIK SOM]

$x^5+2x^3+x^2+2=0$

$\Rightarrow (x+1) (x^2+2)(x^2-x+1)=0$

so $(x+1)=0 \Rightarrow x=-1$ is only the real roots

[KOUSHIK SOM]

we will get back to you soon

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