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2x² -9= (x² -6x +9) - (x²+6x+9)
2x² -9= x² -6x +9 - x² -6x -9
2x² -9= -12x
2x² +12x -9 +0
Δ=144 +72= 216
√Δ=6√6
x= (-12-6√6):4 = (-6-3√6):2
x=(-6+3√6):2