1 answer to question 6 Find out the opening direction, symmetry axis and vertex of the following parabola （1）y=-3x²+12x-3 （2）y=4x²-24x+26 （3）y=2x²+8x-6 （4）y=1/2x²-2x-1

1 answer to question 6 Find out the opening direction, symmetry axis and vertex of the following parabola （1）y=-3x²+12x-3 （2）y=4x²-24x+26 （3）y=2x²+8x-6 （4）y=1/2x²-2x-1

Your questions are all of the same type
Suppose that the quadratic function is y = ax ^ 2 + BX + C if a > 0 and the opening is upward if a

How to solve the seventh problem in mathematics book of volume two of grade nine
Our teacher said set DC = x, but I still don't know which fairy sister to help me
Question 7 of exercise 26.3! ==

According to the questions in your question, a:
∵ cdef is a rectangle and F is on BC
∴DE∥CB
∴△ADE∽△ACB
∴AD/AC = DE/CB.①
∵∠A=30°,∠C=90°,AB=12
∴AC=6√3,BC=6.②
Let DC = X
Then ad = 6 √ 3 - X. ③
In conclusion, de = 6 - (√ 3 / 3) X
∴SCDEF=DC×DE=x[6 - (√3/3)x]=-(√3/3)x² + 6x=-(√3/3)(x² - 6√3x)=(-√3/3)(x - 3√3)² + 9√3
When x = 3 √ 3, the maximum value of rectangular cdef is 9 √ 3
∵AC=6√3,DC=3√3
D is the midpoint of AC
∵DE∥CB
E is the midpoint of ab

Group tickets are as follows: 12 yuan per person for 50 people, 10 yuan per person for 51-100 people, and 8 yuan per person for more than 100 people. Now there are two tour groups, group A and group B, which have been completed
If you buy tickets separately, the total is 1142 yuan. If you buy tickets together as a group, the total is 864 yuan?

The total number of group A is 864 / 8 = 108. Suppose that the number of group A is small, let the number of group a be x, then the number of group B is (108-x)

When f (x) = (AX ^ 2 + BX + 5) / (X-5) (a, B are constants) ask what values a and B take respectively, the limit x tends to infinity
When f (x) = 1

a=0
b=1

What is the symmetry between the image of function y = 1 / X and the image of function y = - 1 / x
Please state your reasons,

About X-axis symmetry, also about Y-axis symmetry
I don't know if I draw a picture
If you don't draw a picture, you can see that when x is the same, y is on the contrary, indicating that x is symmetric
If y is the same, X is the opposite, indicating that y is symmetric

Then we will drive to Jinan airport to meet you?

Then we will drive to Jinan Airport to fetch you.
perhaps
Then we will drive to Jinan Airport to pick you up.

The result of simplifying m - [- 2m - (m-n)] is ()
A. -2mB. 2mC. 4m-nD. 2m-2n

The original formula is m + 2m + M-N = 4m-n

The chord length of the line x + 2Y + 9 = 0 cut by the circle X & # 178; + Y & # 178; + 4y-21 = 0 is

The coordinate of the center of the circle is C (0, - 2), the radius of the circle is r = 5, the distance between the center of the circle C and the straight line x + 2Y + 9 = 0 is d = root 5, let the chord length be 2L, then L ^ 2 + D ^ 2 = R ^ 2, and substitute it into the evaluation to get l = 2 root 5, and the chord length is 2L = 4 root 5

How to write English words from January to December

January: January
February: February
March: March
April: April
May: May
June: June
July: July
August: August
September: September
October: October
November: November
December: December

In three consecutive positive integers, if the sum of the squares of the first two numbers equals the square of the third number, then the three numbers are

3 ^ 2 + 4 ^ = 5 ^ 2 in three consecutive positive integers, if the sum of squares of the first two numbers equals the square of the third number, then the three numbers are: 3, 4, 5