Given x2-x-1 = 0, the value of - X3 + 2x2 + 2004 is_____ .

Given x2-x-1 = 0, the value of - X3 + 2x2 + 2004 is_____ .

-x3+2x2+2004
=-x^3+x^2+x+x^2-x-1+2005
=-x(x^2-x-1)+(x^2-x-1)+2005
=2005

If x2-x-1 equals zero, find the value of - X3 + 2x2 + 2006

Because: x2-x-1 = 0, so
(x2-x-1)*(x-a)
=x3-x2-x-a*x2+a*x+a
=x3-(1+a)x2+(a-1)x+a=0
Let a = 1, where x3-2x2 = - 1
Then: - X3 + 2x2 + 2006 = - (x3-2x2) + 2006
=2007

If x2 + X-1 = 0, then the value of the algebraic expression X3 + 2x2-7 is ()
A. 6B. 8C. -6D. -8

From x 2 + X-1 = 0, we get x 2 + x = 1, ｜ x 3 + 2x2-7 = x 3 + x 2 + X 2-7, = x (x 2 + x) + X 2-7, = x + X 2-7, = 1-7, = - 6

A hotel room department has 60 rooms for tourists to live in, when the price of each room is 200 yuan per day, the room can live in
The room department of a hotel has 60 rooms for tourists to live in. When the price of each room is 200 yuan per day, the room can be full. When the price of each room is increased by 10 yuan per day, there will be a room free. For a room with tourists, the hotel needs to pay 20 yuan per day for each room. When the price of each room is 200 yuan per day, the daily profit is 15210 yuan

Suppose the daily price is increased by 10x yuan, then the unit price of each room is 200 + 10x yuan, the room with guest room is 60-x, so the total income is (200 + 10x) * (60-x), the room expenditure is 20 (60-x), so the equation is (200 + 10x) * (60-x) - 20 (60-x) = 15210, and the solution is x = 21

A hotel room department has 60 rooms for tourists to live in. When the price of each room is 200 yuan per day, the room can be full. When the price of each room is increased by 10 yuan per day, there will be a room free. For a room with tourists, the hotel needs to pay 20 yuan per day for each room. Suppose the price of each room is increased by X yuan per day The functional relationship between the daily occupancy y (rooms) and X (yuan); (2) the functional relationship between the daily room charge P (yuan) and X (yuan); (3) the functional relationship between the daily profit w (yuan) and X (yuan) of the room department of the hotel; when the price of each room is how many yuan per day, w has the maximum value? What is the maximum value?

(1) From the question meaning: y = 60-x10 (2 points) (2) z = (200 + x) (60-x10) = - 110x2 + 40x + 12000 (3 points) (3) w = (200 + x) (60-x10) - 20 × (60-x10) (2 points) = - 110x2 + 42x + 10800 = - 110 (x-210) 2 + 15210. When x = 210, w has the maximum value. At this time, x + 200 = 410, that is to say, when the price of each room is 410 yuan per day, w has the maximum value, and the maximum value is 15210 yuan ．

A hotel room department has 60 rooms for tourists to live in. When the price of each room is 200 yuan per day, the room can be full. When the price of each room is increased by 10 yuan per day, there will be a room free. For a room with tourists, the hotel needs to pay 20 yuan per day for all kinds of expenses. Ask the price of each room, how much yuan per day, can it make a profit of 15210 yuan?

Let X be the number of empty rooms
（60-x）（200+10x）-（60-x）*20=15210
x2-42x+441=0
x=21
Price = 200 + 10 * 21 = 410 yuan

Abbreviation of the United Nations: abbreviation of the people's Republic of China;

UN
PRC

What is the abbreviation of the United Nations? What is the abbreviation of UNESCO?
Thank you again!

The abbreviation of the United Nations: UN
UNESCO abbreviation: UNESCO full name: United Nations Nations Educational, scientific and Cultural Organization

Names and abbreviations of five major UN agencies

General assembly of the United Nations (UNGA), Security Council of the United Nations (SC), economic and Social Council of the United Nations (ECOSOC), United Nations Trusteeship Council (UTC)

The abbreviation of Chinese Basketball League

CBA