Question

Rezolvati x labputerea2a-x-4=-2

Answer 1

x labputerea2a-x-4=-2

x²-x-4+2=0

x²-x-2=0

a=1; b=-1; c=-2

Δ=b²-4ac=(-1)²-4×1×(-2) = 1+8=9,      Δ > 0

x₁=(-b+√Δ)/2a=(-(-1)+3)/2=4/2=2

x₂=(-b-√Δ)/2a=(-(-1)-3)/2=-2/2= - 1

Answer 2

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