Question

When b>0 and d is a positive integer, (b)-2/d is equivalent to which of the following expression

Answer 1

the given exoression is

`=b^{-(2)/(d)}`

so,

`b^{-(b)/(2)}=\frac{1}{b^{(2)/(d)}}`
`=\frac{1}{(\sqrt[d]{b})^2}`

thus, the correct answer is option A