Question

Rezolvati ecuatiile :

a)5(x+2)-4(x-2)=3(x+8)
b)4(x+5)-3(x-3)=2(x+15)
c)7(x-9)-4x=x-39

Answer 1

o formula pt inceput: a(x+sau- b)=a ori x +\- a ori
in loc de a si b poate sa fie alte numere

a) 5(x+2)-4(x-2)=3(x+8)
5x+10 -4x+8=3x+24
cei cu x ii punem in partea stanga de egal cu semn schimbat si cei fara x in partea dreapta de egal cu semn schimbat
5x-4x-3x=-10-8+24
-2x=-16
x=-16/-2
x=8

Answer 2

a) 5x+10-4x+8=3x+24
x+18=3x+24
x-3x=24-18
-2x=6|•(-1)
2x=-6
x=-6:2=-3

b)4x+20-3x+9=2x+30
x+29=2x+30
x-2x=30-29
-x=1 |•(-1)
x=-1

c)7x-63-4x=x-39
3x-63=x-39
3x-x=-39+63
2x=24
x=24:2=12