Question

Plz plz. fast give answer

Answer 1

Answer:

M-1

Take lcm and use Lhopital rule

Boring , lengthy and scary though

Now

M-2

Do you remember definition of derivative

$f'(x) = lim_{h \to0} \frac{f(x + h) - f(x)}{h} \\ \\ if \: \: u \: \: take \: \: f(x) = \frac{1}{ \sqrt{x} } \: \: and \: apply \\ the \: same \: \: u \: get \: \: what \: u \: \: asked \\ \\ so \: your \: \: limit \: \: is \: \: nothing \: \: but \\ \\ = f '(x) = \frac{d}{dx} ( \frac{1}{ \sqrt{x} } ) = \frac{ - 1}{2x \sqrt{x} }$