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Автор - vladislavchik93

помогите пожайлуста!!!
нужно к завтра!
можно делать не всё!
ВАРИАНТ 2!!!​

Ответ

Автор - alina432334

№1

1)

 {x}^{2}  - 2x - 35 \ d =  {b}^{2}  - 4ac =  {2}^{2}  - 4 times 1 times ( - 35) = 4 + 140 = 144 \ x1 =   frac{ - b  +   sqrt{d} }{2a }  =   frac{ - ( - 2)  +   sqrt{144} }{2 times 1}  =  frac{2 + 12}{2}  =  frac{14}{2}  = 7 \ x2 =  frac{ - b -  sqrt{d} }{2a}  =  frac{ - ( - 2) -  sqrt{144} }{2 times 1}  =  frac{2 - 12}{2}  =  frac{ - 10}{2}  =  - 5 \  {x }^{2}  - 2x - 35 = (x + 5)(x - 7)

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