Question

Tolong nomor 3-5 cepaten...

Answer 1

3.
f(x)= 1/3 x^3 -2/3 x^2 -3x
f'(x)= 3*1/3*x^(3-1) -2/3*2*x^(2-1) -3*1*x^(1-1)
= x^2 -4/3x -3

f"(x)= 2*x^(2-1) -4/3*1x^(1-1)
=2x -4/3

4.
A. y= (2x-5)/(4x+6)
y' = 2/4= 1/2

B. y= (x^2-5)/(x+2)
y' = 2x/1= 2x


5.y= x^3 -5x^2 +3x +4
y'= 3x^2 -2*5*x +3
= 3x^2 -10x +3

x=3
y'= 3x^2 -2*5*x +3
= 3(3)^2 -10(3) +3
= 27-30+3= 0
jadi turunan dari y dengan x= 3 bernilai 0.