Пожалуйста ❤️❤️❤️ алгебра 8 класс . Created by oladushek80. algebra-ru

Пожалуйста ❤️❤️❤️ алгебра 8 класс ...

oladushek80 @oladushek80

October 2021 1 6 Report

Пожалуйста ❤️❤️❤️ алгебра 8 класс

Answers & Comments

michindjeva

Ответ:

$1) \: 2 {x}^{2} + 3x - 7 = 0 \\ d = 9 - 4 \times 2 \times ( - 7) = 65 \\ d > 0 \\2) \: 3 {x}^{2} - 4x + 6 = 0 \\ d = 16 - 4 \times 3 \times 6 = - 56 \\ d < 0 \\ 3) \: {x}^{2} - 4x - 4 = 0 \\ d = 16 - 4 \times ( - 4) = 32 \\ d > 0$

Объяснение:

если дискриминант >0 2 корня,

если дискриминант <0 нет корней

В1-ом и 3-ем 2 корня, во 2-ом нет корней

ответ: 2,1,3

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