Late $a\in R$and let $f:R\stackrel{⃗}{}$be given by $f\left(x\right)=x^5-5x+a,$then$f\left(x\right)$has three real roots if $a>4$$f\left(x\right)$has only one real roots if $a>4$$f\left(x\right)$has three real roots if $a<-4$$f\left(x\right)$has three real roots if $-4<a<4$

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