Question

Fie A multimea solutiilor reale ale ecuatiei$x^{2}$+x -6=0. Determinati card (A\N).
Dau coroana

Answer 1

Răspuns:

x²+x-6=0

Δ=1²-4*(-6)=1+24=25

x1=$\frac{-1-\sqrt{25} }{2} =\frac{-1-5}{2}=\frac{-6}{2} =-3$

x2=$\frac{-1+5}{2} =\frac{4}{2} =2$

A={-3, 2}

A\N={-3,2}\N={-3}

card A\N=1

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