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akar-akar: x₁ dan x₂
x₁² + x₂² - 2x₁x₂ = 8m
(x₁ - x₂)² = 8m
b² - 4ac = 8m
(m - 1)² - 4 1 (-5) = 8m
m² - 2m + 1 + 20 = 8m
m² - 10m + 21 = 0
(m - 7) (m - 3) = 0
m = 7 atau m = 3