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Δ = [-(m + 1)]² - 4 × 1 × m = m² + 2m + 1 - 4m = m² - 2m + 1 = (m - 1)²
√Δ = m - 1
x₁ = (m + 1 - m + 1) / 2 = 2/2 = 1
x₂ = (m + 1 + m - 1) / 2 = 2m / 2 = m
Warunek
Ix₁ - x₂I = 1
I1 - mI = 1
1 - m = 1 ∨ 1 - m = -1
-m = 1 - 1 ∨ -m = -1 - 1
-m = 0 ∨ -m = -2
m = 0 ∨ m = 2