Предмет: Алгебра, автор: gulshanzufarova

. Дана функция: f(x)=-х2- х+12;

а) Найдите значения функции f(3), f(-5)

Известно, что график функции проходит через точку (k;6).
b) Найдите значение k.
​

Ответы

Автор ответа: Ифигения
6

Ответ: а) 0; -8 b) -3; 2.

Объяснение:

a) f(3) = -3² - 3 + 12 = -9 - 3 + 12 = 0

f(-5) = -(-5)² + 5 + 12 = -25 + 5 + 12 = -8

b) -k² - k + 12 = 6

-k² - k + 6 = 0

k² + k - 6 = 0

По т. Виета:

k1 = -3

k2 = 2

gulshanzufarova: спасибо огромное
Ифигения: Не за что.
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