1
y`=6x²-6x-12=6(x²-x-2)=0
x1+x2=1 u x1*x2=-2⇒x1=-1 U x2=2
+ - +
---------------(-1)----------------(2)-------------------
возр убыв возр
2
y`=3x²-12x+9=3(x²-4x+3)=0
x1+x2=4 u x1*x2=3⇒x1=1 U x2=3
+ - +
---------------(1)----------------(3)-------------------
возр убыв возр
3
y`=10-1/x=(10x²-1)/x=0
10x²=1⇒x²=1/10⇒x=-1/√10 U x=1/√10
+ - +
---------------(-1√10)----------------(1/√10)-------------------
возр убыв возр
4
y`=1/x-4x=(1-4x²)/x=0
1-4x²=0⇒4x²=1⇒x²=1/4⇒x=-1/2U x=1/2
_ + _
-----------------(-1/2)-------------(1/2)----------------
убыв возр убыв