Предмет: Алгебра, автор: tyannyan

Построить график функции : у = - x^2 6х-5. Найти : а) область значения функции; б) промежутки возрастания и убывания функции

Ответы

Автор ответа: Raylend

Полагаю, что вы опечатались, и функция имеет вид: $y = - x^{2} + 6*x - 5$
Для того, чтобы решить задачу, нужно найти координаты вершины по формуле: $x = - \frac{b}{2a}$ , где b = +6, a = -1. Так как коэффициент при х отрицательный, то функция возрастает на промежутке от минус бесконечности до значения х вершины, и убывает отсюда до + беск. Область значения функции меняется от минус беск. ветви вниз) до у вершины. Вам осталось только подставить в формулу числа, найти сначала х вершины, потом у вершины. А для построения графика удобно брать точки, равноудалённые от вершины. Удачи!

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Здравствуйте.
Прошу помочь пройти тест.Present Simple
I. Choose the correct variant.
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A is
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1. A) I not usually have lunch at home.
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D) I usually have lunch at home.

2. A) My friend don’t goes to the cinema a lot.
B) My friend not goes to the cinema a lot.
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3. A) Do his father drive a car very fast?
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4. A) Do the shops close at 8 o’clock in the evening?
B) Does the shops close at 8 o’clock in the evening?
C) Do the shops closes at 8 o’clock in the evening?
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5. A) You often play basketball?
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7. A) She come home early.
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C) She don’t come home early.
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8. A) Why doesn’t you come to the cinema?
B) Why you not come to the cinema?
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D) Why don’t you come to the cinema?

9. A) My brother never wait for us.
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