Question

care ma poate ajuta la fisa asta ??

Answer 1

Ex 1
a) 3x+6-8=8x+6-3x
3x+3x-8x=6-6+8
6x-8x=8
-2x=8
x=-4 adevărat
b) 12x+8+6x+9=14x+35+28
18x+17=14x+63
18x-14x=63-17
4x=46
x=11,5 Fals
Ex 2
a) 2x2(a+3)-3a2=18
4(a+3)-6a=18
4a+12-6a=18
4a-6a=18-12
-2a=6
-a=3
a=-3
b)-12-a(-3+5)=-6a+16
-12-2a=-6a+16
-12-16=-6a+2a
-28=-4a
-a=-7
a=7