-
tosia: funkcja okreslona wzorem f(x) = x2 + x − 4 nie przyjmuje wartosci
:
12 paź 18:37
ak1: Oblicz wsp. y wierzchołka wg. wzoru q=−Δ4a
to będzie minimum funkcji.
12 paź 18:45
tosia: Nie wychodzi
12 paź 19:21
mila: Wartości funkcji to y czyli mamy znależc liczby, które w tej funkcj nie mogą być y
jezeli a>0 parabola ma ramiona w górę czyli najmniejszy y jest tam gdzie parabola ma
wierzchołek.
y=ax
2+bx+c
y=x
2+x−4
| | −Δ | |
a=1 b=1 c=−4 wspólrzedna y wqierzchołka q= |
| |
| | 4a | |
czyli najpierw liczymy Δ
Δ=b
2−4ac
Δ=1−4(−4)=1+16=17
y nie mogą byc liczby mniejsze od −4{1}{4}
| | 1 | |
odp Funkcja nie przyjmuje wartości ( −∞ −4 |
| ) |
| | 4 | |
| | −b | |
Nie trzeba ale jeszcze wyliczę współrzedna x wierzchołka czyli p p= |
| zebys |
| | 2a | |
zobaczyła jak sie rysuje wykres
krzywy ale chyba będziesz wiedziała o co chodzi
Niestety kilkanascie minut trwało zapisywanie i w koncu usunelam wykres
12 paź 19:56
mila: Wartości funkcji to y czyli mamy znależc liczby, które w tej funkcj nie mogą być y
jezeli a>0 parabola ma ramiona w górę czyli najmniejszy y jest tam gdzie parabola ma
wierzchołek.
y=ax
2+bx+c
y=x
2+x−4
| | −Δ | |
a=1 b=1 c=−4 wspólrzedna y wqierzchołka q= |
| |
| | 4a | |
czyli najpierw liczymy Δ
Δ=b
2−4ac
Δ=1−4(−4)=1+16=17
y nie mogą byc liczby mniejsze od −4{1}{4}
| | 1 | |
odp Funkcja nie przyjmuje wartości ( −∞ −4 |
| ) |
| | 4 | |
| | −b | |
Nie trzeba ale jeszcze wyliczę współrzedna x wierzchołka czyli p p= |
| zebys |
| | 2a | |
zobaczyła jak sie rysuje wykres
krzywy ale chyba będziesz wiedziała o co chodzi
Niestety kilkanascie minut trwało zapisywanie i w koncu usunelam wykres
12 paź 19:58
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12 paź 19:59
tosia: powinno być −5
12 paź 20:04
mila:
Niemożliwe,nie moze byc zaden y mniejszy od −4U{1]{4]
12 paź 20:14
Bogdan:
tosia − podaj pełną treść zadania.
12 paź 21:07