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5) 2x²-x-2=0 10=6²-4=0.1 Δ 0=2 8=-72 0 = (-713-4.2 (1) 0=778 ∆= 9
[tex]1x {}^{2} = - b - \sqrt{?} ....x2 = - b + \sqrt{?} [/tex]