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Solve: -x^2+x-2=0...

Solve: `-x^2+x-2=0`

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b^(2)-4 a c=1^(2)-4 x(-1) x-2=1-8=-7.
.therefore. The solutions are given by .x=(-1 pm sqrt(-7))/(2 x-1)=(-1 pm sqrt(7))/(-2).
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