x^2 - 2(m-2)x + m^2 - 2m -3 = 0
Δ =(2m-4)² - 4*(m²-2m-3)=4m²-8m+16-4m²+8m-12=28
x₁ > 0 ⇔ (2m+4 - √28)/2 > 0
x₂ > 0 ⇔ (2m+4 + √28)/2 > 0
m > -4+√28/2
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x^2 - 2(m-2)x + m^2 - 2m -3 = 0
Δ =(2m-4)² - 4*(m²-2m-3)=4m²-8m+16-4m²+8m-12=28
x₁ > 0 ⇔ (2m+4 - √28)/2 > 0
x₂ > 0 ⇔ (2m+4 + √28)/2 > 0
m > -4+√28/2