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y₂ = -x₂ +6x - 5
y₁-y₂ = 0
x² + x² -4x - 6x + 3 + 5 = 0
2x² -10x + 8= 0
D= b²-4ac= (100)- (64) = 36
L = D√D/(6a²)
L = 36(6)/(6)(4)=9