If $t_r$ is the $r^{ ext {th }}$ term in the expansion of $\left(2^x+4^{-x} ight)^8$ and if $t_3=7 t_2$ then $x=$

Question

If $t_r$ is the $r^{	ext {th }}$ term in the expansion of $\left(2^x+4^{-x}ight)^8$ and if $t_3=7 t_2$ then $x=$

Aicharya · Accepted Answer

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If $t_r$ is the $r^{\text {th }}$ term in the expansion of $\left(2^x+4^{-x}\right)^8$ and if $t_3=7 t_2$…