Final Answer
$-5x^8+x^4+x^2$
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Step-by-step Solution
Specify the solving method
1
Multiply $1$ times $-5$
$order\left(x^2+x^4-5x^8,x,1\right)$
2
Apply the formula: $order\left(x,a,b\right)$$=order\left(x,a,b\right)$, where $a=x$, $b=1$ and $x=x^2+x^4-5x^8$
$-5x^8+x^4+x^2$
Final Answer
$-5x^8+x^4+x^2$