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x²-12x+36=5²
x²-12x+36-25=0
x²-12x+11=0
Δ=b²-4ac=144-44=100
√Δ=10
x₁=(-b-√Δ):2a=(12-10):2=1
x₂=(-b+√Δ):2a=(12+10):2=11