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↓ ↓ ∵ x-5=0 ∵x-1=0
x -5 ∴ (x-5)(x-1) x=5 x=1
x -1
C.S(1,5)
2. x²-6x₊9
↓ ↓
x -3
x -3 ∵(x-3)(x-3) ∴x-3=0 CS (3)
x=3
3. Δ=-6²-4(1)(10)
Δ=36-40 x₁ = -(-6)₊√-4/2(1) x₂=-(-6)₋√-4/2(1)
Δ=-4 x₁= 6₊ 2i/2 x₂= 6-2i/2
x₁=3₊2i x₂=3-2i