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x²-x-2>0
a=1 b= -1 c= -2
Δ=b²-4*a*c= (-1)²-4*1*(-2)= 1+8= 9
√Δ=3
x₁= -b+√Δ/2a= 1+3/2=4/2=2
x₂= -b-√Δ/2a=1-3/2=-2/2=-1
x>2
x>0
Pozdrawiam M:)