1
3b²+2b-1=3(b+1)(b-1/3)=(b+1)(3b-1)
D=4+12=16
b1=(-2-4)/6=-1
b2=(-2+4)/6=1/3
(b+1)(3b-1)/(1-b)(1+b)=(3b-1)/(1-b)
2
Нули (0;0);(5;0)
возр x∈[-3;0) U (2,5;5]
убыв x∈(0;2,5)
E(y)∈[-4;0]
0.4^(x^2-1) > 1--->0.4^(x^2)>0.4---->x^2=1---->-1<x<1
1)...=2х+16+18=х
2х-х=-16-18
х=-34
P равен 98 Н (10g = 10*9.8)