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If the term free form x in the expansion...

If the term free form x in the expansion of `(sqrt(x)-m/(x^(2)))^(10)` is 405, find the value of m.

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The general term in the expansion of
`(sqrt(x)-m/(x^(2)))^(10)`
`T_(r+1) =10_(C_r) (sqrtx)^(10-r) (-m/x^2)^r`
`=10_(C_r) x^((10-r)/2) . (-m)^r . x^(-2r)`
...
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