D = 49 - 4*2*(-4) = 49 + 32 = 81 ; V D = 9 X1 = ( 7 + 9 ) \ 4 = 16 \ 4 = 4 X2 = ( - 2 ) \ 4 = ( - 0.5) -----------------------------------------------------------------> - 0.5 4 Ответ: ( - бесконечность ; - 0.5 ]