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riadik2000 [5.3K]
3 years ago
15

Write the function in vertex form. y=-x^2-8x-9

Mathematics
1 answer:
xeze [42]3 years ago
4 0

Answer:

y = -(x+4)² +7

Step-by-step explanation:

I find it convenient to factor the leading minus sign from the first two terms, then work with what's left.

... y = -(x² +8x) -9

Now, add the square of half the x-coefficient inside parentheses. Add the opposite of that amount outside parentheses.

... y = -(x² +8x +4²) -9 +4²

... y = -(x +4)² +7 . . . . . . . . . rewrite parentheses as a square; collect terms

You might be interested in
Solve the equations using the substitution method:<br> 4x -2y =22<br> 2x + 4y = 6
Ugo [173]
We have that
<span>4x -2y =22------> clear variable y
2y=4x-22--------> y=4x/2-22/2---------> y=2x-11-----> equation 1
2x + 4y = 6------> equation 2

substitute equation 1 in equation 2
2x+4*[2x-11]=6-----> 2x+8x-44=6----> 10x=50------> x=5
then 
y=2x-11----> y=2*5-11----> y=-1


</span>
4 0
3 years ago
The local high school sold 1914 tickets this year to its spring musical. That was 174 more tickets sold than last year. What is
pantera1 [17]

Answer:

.909 (ROUNDED)

Step-by-step explanation:

In order to do this all you need to do is divide the number with the number you got this year, 1914, and with the number last year.

1914-174=1740

1740 was the amount they got last year

Now you want to find the percent difference between the two.

1740/1914=.909090 (Repeats)

So the percent increase would be

.909090

.101010

3 0
3 years ago
Which equation has the solution x = 5?
otez555 [7]

Answer:

Here are your answers!

Step-by-step explanation:

x/5+5=6 is x=5.

18-2x=9 is NOT x=5, it is x=9/2

32-4x=12 is x=5.

11+6x=22 is NOT x=5, it is x - 11/6

3x+1=9 is NOT x=5, it is x = 8/3

25/x+4=9 is x=5.

Brainliest please!

7 0
2 years ago
Read 2 more answers
HELP UUUURRRRRRRGGGGGEEEEEENNNNTTTTT PLLLLZZZZZ IM BAD AT MATHHHHHHHH
fomenos

Answer:

-1 8/9

Step-by-step explanation:

w + ( - x)

w = -5/9

z = 4/3

Input:

-5/9 + ( -4/3)

-5/9 - 4/3

-4/3 * 3/3 = -12/9

-5/9 - 12/9 = -17/9 = -1 8/9

If my answer is incorrect, pls correct me!

If you like my answer and explanation, mark me as brainliest!

-Chetan K

4 0
3 years ago
Could someone help i'll give you 30 points just help due by midnight thanks
kap26 [50]
For number 5. X=12.5 and for number 6. X=4

Hope this helps :)
4 0
2 years ago
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