4
y=3x²-12x+1
1)x=-2
y(-2)=12+24+1=37
y`=6x-12
y`(-2)=-12-12=-24
Y=37-24(x+2)=37-24x-48=-24x-11
2)x=1
y(1)=3-12+1=-8
y`(1)=6-12=-6
Y=-8-6(x-1)=8-8x+6=-8x+14
5
SABC пирамида,AB=BC=AC=1см,Sбок=3см²
Sбок=1/2*3AB^SH=3/2*1*SH=3
SH=3:3/2=3*2/3=2
BH=ABsin60=1*√36/2=√3/2см
BO:OH=2:1⇒OH=1/3*BH=1/3*√3/2=√3/6см
SO=√(SH²-OH²)=√(4-3/36)=√(141/36)=√141/6
V=1/3*AB²sin60*SO=1/3*1*√3/2*√141/6=3√47/36=√47/12см³