r - Expressions in markdown using knitr -

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i'm trying use inline expression in .rmd markdown file. i'm converting .rmd file pdf using pandoc. contents of file this:

report  ========================================================  text , expression 100km^2  ```{r} summary(cars) ```

i expected 100km^s render normally, renders literally '100km^2'. how can expression render?

you can use latex math mode this,

knit(text="$100 km^2$",output="test.md") pandoc("test.md", format="latex")

gives me:

enter image description here


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