Question

Urgent !!! Doar ex. 4

Answer 1

a) 2a-3(-3-a) =3-a
2a+9+3a=3-a
5a+a=3-9
6a= -6
a= -1

b) a=3
6-3(x-3)=3-3
6-3x+9=0
-3x= -15
x=5

c) a=2
4-3(x-2)=3-2
4-3x+6=1
-3x= -9
x=3

a=3 la care x=5

a=4
8-3(x-4)=3-4
8-3x-12= -1
-3x=3
x= -1

a=5
10-3(x-5)=3-5
10-3x+15= -2
-3x=-27
x=9
deci x €[3,+infinit)