Răspuns :
1) x²+x+2=0
Δ=1-4×2=-7
x₁ =(-1-√-7)/2=(-1-i√7 )/2≈ -0,5000-1,3229i
x₂ =(-1+√-7)/2=(-1+i√7 )/2≈ -0,5000+1,3229i
2) -x² -x-1=0
Δ=1-4=-3
x₁ =(1-√-3)/(-2)=-1/2+i/2√ 3 ≈ -0,5000-0,8660i
x₂ =(1+√-3)/(-2)=-1/2-i/2√ 3 ≈ -0,5000+0,8660i
Δ=1-4×2=-7
x₁ =(-1-√-7)/2=(-1-i√7 )/2≈ -0,5000-1,3229i
x₂ =(-1+√-7)/2=(-1+i√7 )/2≈ -0,5000+1,3229i
2) -x² -x-1=0
Δ=1-4=-3
x₁ =(1-√-3)/(-2)=-1/2+i/2√ 3 ≈ -0,5000-0,8660i
x₂ =(1+√-3)/(-2)=-1/2-i/2√ 3 ≈ -0,5000+0,8660i
1) x²+x+2=0
Δ=1-4×2=-7
x₁ =(-1-√-7)/2=(-1-i√7 )/2≈ -0,5000-1,3229i
x₂ =(-1+√-7)/2=(-1+i√7 )/2≈ -0,5000+1,3229i
2) -x² -x-1=0
Δ=1-4=-3
x₁ =(1-√-3)/(-2)=-1/2+i/2√ 3 ≈ -0,5000-0,8660i
x₂ =(1+√-3)/(-2)=-1/2-i/2√ 3 ≈ -0,5000+0,8660i
Cam asa ceva
Δ=1-4×2=-7
x₁ =(-1-√-7)/2=(-1-i√7 )/2≈ -0,5000-1,3229i
x₂ =(-1+√-7)/2=(-1+i√7 )/2≈ -0,5000+1,3229i
2) -x² -x-1=0
Δ=1-4=-3
x₁ =(1-√-3)/(-2)=-1/2+i/2√ 3 ≈ -0,5000-0,8660i
x₂ =(1+√-3)/(-2)=-1/2-i/2√ 3 ≈ -0,5000+0,8660i
Cam asa ceva