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a fost răspuns

A) 6(x-1)+6=30
B) 6(x-1)=60
C) x²=9
D) 2x²-18=0
E) x²-3x+2=0

Răspuns :

Bia1324

a) 6x+6+6=30

6x+12=60

6x=48

x=48÷6

x=8

b) 6x-6=60

6x=66

x=66÷6

x=11

c) x apartine {-3;3}

d) 2x^2=18

x^2=9

x apartine {-3;3}

e) x^2-3x=-2

daca x=1 => 1-3=-2 adevarat

daca x=2 => 4-6=-2 adevarat

daca x>=3 => x^2-3x>0 fals

deci x apartine {1;2}