Question

Find the derivative of sqrt(9-x)

Answer 1

Remember that \[\huge √x = x^½ \ and \ 1/√x = x^-½ \]
Also remember that \[\huge \frac {d(x^k)} {dx} = kx^{k-1} \]

Answer 2

Get that

Answer 3

-[sqrt(9-x)]^(-1/2) ???

Answer 4

I understand that needs to be simplified, but is it essentially correct?