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2x²-4x+2=x²+6x+9
2x²-4x+2-x²-6x-9=0
x²-10x-7=0
Δ=b²-4ac
Δ=10²+4*7=128
√Δ=8√2
x=1/2*(10-8√2)=5-4√2 v x=5+4√2