Question

ajutați ma va rog frumos ofer Coroana + inimi multumesc mult​

Answer 1

a)x²+2x+1=0

(x+1)²=0 x1,2=-1

a≠-1

b)a=-1

c) a≠0

d)x²-9=0

(x-3)(x+3)=0. x1=3. x2=-3

a=3

e)2x²+3x+1=0

2x²+2x+x+1=0

2x(x+1)+x+1=0

(x+1)(2x+1)=0

a≠-3

f)x²=-1 fals

a≠1