hey everyone i have some questions i need some help with. if you know the answer can u please help me

i need to differentiate these

1. x√(x_1)

2. 4x/(x^+x+3)^2

3. x/√(x_1)

i need someone to check my answers to these questions

a, 1/3√(x^4)

dy/dx = -1/3*4x^3*(x^4)^-4/3

= -4/3 x^-(5/3)

b, (1-4x)^3/2

answer -6(1_4x)^1/2

and lastly i need help with this question

determine the relationship between the normal to the curve y=y = x^3-2 x at x=1 and x=-1

pleassssse helppppp

thanx