Răspuns:
2.f `(x)=-5
f``(x)=0
5) ecuatia tangentei
f(x)-f(xo)=f `(xo)(x-xo)
f(-1)=2/(-1)= -2
f `(x)=-2/x²
f`(-1)= -2/(-1)²=-2/1= -2
f(x)-(-2)= -2(x-(-1))
f(x)+2=-2(x+1)
f(x)+2= -2x-2
f(x)= -2x-4
ex 4) f `(x)=ae^x*a
f ``(x)=a²e^ax
3a²e^ax-8ae^ax+e^ax=0
e^ax(3a²-8a+5)=0
3a²-8a+5=0
Δ= =(-8)²-60=64-60=4
a1=(8+√4)/6=10/6=5/3
a2=(8-√4)/6=8-2)/6=1
ex 1
acceleratia e derivata a 2 a a spatiului
s `(t)=4t+8/t
s ``(t)=4-8/t²
4-8/t²=2
4-2=8/t²
2=8/t²
t²=2/8=1/4
t=√1/4
t=1/2 =0,5s
3b)
f `(x)=3/cos²(3x-π/4)
g `(x)=6
3 /cos²(3x-π/4)=6║:3
1/cos²(3x-π/4)=2
cos²(3x-π/4)=1/2
cos(3x-π/4)=+√2/2
3x-π/4=arc cos√2/2
3x-π/4=π/4
3x=π/4+π/4
3x=π/2
x=π6
x=π/6+2πK
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