9z + 9 - z³ - z² = 0
9(z + 1) - z²(z + 1) = 0
(9 - z²)(z + 1) = 0
(3 - z)(3 + z)(z + 1) = 0
z1 = 3 z2 = - 3 z3 = - 1
p³ - p² - 4p + 4 = 0
p²(p - 1) - 4(p - 1) = 0
(p² - 4)(p - 1) = 0
(p - 2)(p + 2)(p - 1) = 0
p1 = 2 p2 = - 2 p3 = 1
Ж) b2+6b-9
З) 25y2+10xy-4x2
............................................................................
6х^2-29х+30<0
6х2-29х<-30
х(6х-29)<-30
х<-30
6х-29<-30
6х<-30+29
6х<-1
х<-1/6
5х+3>3х^2
-3х2+5х>-3
-х(3х-5)>-3
-х>-3
х>3
3х-5>-3
3х>-3+5
3х>2
х>2/3
Вроде так...