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Ответ:

[tex]4. - 2x ^{2} + 3x + 5[/tex]

[tex]d = 3 ^{2} - 4 \times ( -2) \times 5 = 9 + 40 = 49[/tex]

[tex]x1 = \frac{ - 3 + 49}{2 \times ( - 2)} = \frac{ - 3 + 7}{ - 4} = - 1[/tex]

[tex]x ^{2} = \frac{ - 3 - 49}{2 \times ( - 2)} = \frac{ - 3 - 7}{ - 4} = 2.5[/tex]

[tex] - 2x ^{2} + 3x + 5 = - 2(x + 1)( - 2.5)[/tex]