1) y=(3-4x)^5
y'=5*(3-4x)^4*(-4)
y'=-20*(3-4x)^4
2)
y=sqrt(12-5x)
y=(12-5x)^(1/2)
y'=1/(2*sqrt(12-5x))*(-5)
y'=-5/(2*sqrt(12-5x))
1)
