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1- x1 +x2>0
2- x1*x2>0
wiadomo ze x1+ x2= - b/a= - (k+1)/1= - k-1
zatem -k-1>0
k<1
2- x1*x2= c/a niestety połknełas znak w tresci zadania:((( ale wierze ze sobie poradzisz