y=x²-8x-9
x²-8x-9=0
Δ=b²-4ac=64+36=100
√Δ=10
x₁=[-b-√Δ]/2a=[8-10]/2=-1
x₂=[-b+√Δ]/2a=[8+10]/2=9
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y=x²-8x-9
x²-8x-9=0
Δ=b²-4ac=64+36=100
√Δ=10
x₁=[-b-√Δ]/2a=[8-10]/2=-1
x₂=[-b+√Δ]/2a=[8+10]/2=9