Question

3. Rezolvă inecuatiile: a) 4x - 2 > 0; b) 3x + 5 < 0; c) |2x - 11 < 3; d) |3x - 21 < 1; e) x2 +63 +9 < 4; f) 4.x2 + 4x +1 < 9; x2 + 4x + 4 > 0; - 1 - 6x + 1 +1 ​

Answer 1

Răspuns:

a) 4x-2>0

4x>2

x>2/4 -simplificare (:2)

x>1/4

b)3x+5<0

3x<-5

x<-5/3

c)2x-11<3

2x<14

x<7

d)3x-21<1

3x<22

x<22/3

e)X2+63+9<4

X2+72<4

X2<-68

x<-34

f)4•x2+4x+1<9

8x+4x+1<9

12x+1<9

12x<8

x<12/8