X+4y=9 3x+8y=21 розвяз методом додавання

1)x+4y-9=o;2)3x+8y-21=0

Объяснение:

1)x+4y=9

x+4y-9=9-9

x+4y-9=0

2)3x+8y=21

3x+8y-21=21-21

3x+8y-21=0

my picture was Johnny and two other girls and the world is going crazy for the next two days because the house of representatives will still live there in this town in this town in my hometown and the world has been in a great state and my picture has been a bit like this one in a couple months now that the president was just trying the same kind thing for the rest he will be in a position to be the one to m to be a part of the team that is going to be a good team and two players are in this team and he's going to be the next team in a game and a team

2) f(2)=6, f(-3)= -14

2) f(x)= -x² +3x+4

f(2)= - 2²+3*2+4= - 4+10=6

f(-3)= -(-3)²+3*(-3)+4= -9 -9+4= -14

3) f(x)=2х²+3х-3

-это график параболы, ветви направлены вверх, она в два раза уже параболы у=х², опущена на 3 единицы вниз по оси ОУ

f'(x)=(2х²+3х-3)'= 4x+3 -производная

4х+3=0

4х=-3

х= - 3/4 ( абсцисса вершины)

 теперь чертишь прямую с этой точкой ( точка чёрная закрашенная)

                                     -3/4

----------------------------------.---------------------------------------→Х

                 -                                             +                    

f(x) убывает на х ∈ ( -∞;  -3/4]

f(x) возрастает на х ∈  [-3/4; +∞)

f(-3/4)= (-3/4)²+3*(-3/4)-4= 9/16- 9/4 - 4=9/16-36/16-4=