1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Korolek [52]
3 years ago
14

HELP ASAP Find the zeros of y = x^2 - 4x - 9 by completing the square.

Mathematics
2 answers:
Juli2301 [7.4K]3 years ago
5 0

The given equation is :

y=x^{2} -4x-9

Replacing y as zero, we get,

x^{2} -4x-9=0

Now solving this quadratic equation using formula:

x1,2=\frac{-b+\sqrt{b^{2}-4ac}}{2a} and

x1,2=\frac{-b-\sqrt{b^{2}-4ac}}{2a}

Putting a=1, b=-4, c=-9 we get

x=2+\sqrt{13} and x=2-\sqrt{13}

So, option B is the correct answer.

Alla [95]3 years ago
4 0

Answer: x= 2 + √ 13 ,2- √ 13

Step-by-step explanation:

Replace y with 0 and solve for x

You might be interested in
If RST XYZ, which statement must be true?
olga nikolaevna [1]
A because the angles match
5 0
2 years ago
Read 2 more answers
30 points
igomit [66]
Since the rate of descent is a constant this is a linear equation and can be expressed as:

h=vt+b, where h=feet, v=slope or rate, b=y-intercept (y value when x=0 which is the initial height)

h=-2t+b, using the point (3,67) we can solve for b, or the initial height

67=-2(3)+b

67=-6+b

73=b  so the initial height was 73 ft and the height equation is then:

h(t)=67-2t so when t=8 you have:

h(8)=67-2(8)

h(8)=67-16

h(8)=51 ft
8 0
3 years ago
Need some help with this
kramer

Answer:

Step-by-step explanation:

The total number of outcomes the two fair number cubes are thrown is 36. This can be seen by counting the outcomes shown on the table.

a) for a sum of 4, there are only 3 possible outcomes. They are 3,2 2,2 and 1,3

Therefore, the probability of getting a sum of 4 will be

3/36 = 1/12

b) for a sum of 5, there are only 4 possible outcomes. They are 4,1 3,2 2,3 and 1,4

Therefore, the probability of getting a sum of 4 will be

4/36 = 1/9

c)for a sum of 6, there are only 5 possible outcomes. They are 5,1 4,2 3,3 2,4 and 1,5

Therefore, the probability of getting a sum of 6 will be

5/36 = 5/36

The probability that the sum of the results of the throw is 4,5 or 6 would be

1/12 + 1/9 + 5/36 = (3 + 4 + 5)/36 = 12/36 = 1/3

7 0
3 years ago
Cheryl painted her living room walls with two different colors. She painted part of the room yellow and another part green. If t
kramer

Answer:

Total percent of the room did she paint green = 60%

Step-by-step explanation:

Given - Cheryl painted her living room walls with two different colors. She painted part of the room yellow and another part green. If the surface area of the walls in her room is 720 ft² and she painted 288 ft² yellow.

To find - What percent of the room did she paint green ?

Proof -

Given that,

The surface area of the walls in her room = 720 ft²

Total area painted in yellow color = 288 ft²

So,

Total area painted in green color would be = 720 - 288 = 432 ft²

Now,

Let the total percent green color painted = x

So,

720 × x% = 432

⇒720*\frac{x}{100}  = 432

⇒ x = \frac{432*100}{720} = 60

∴ we get

Total percent of the room did she paint green = 60%

7 0
3 years ago
P(x) = 4x^2 - 15x - 25
Airida [17]
The answear is P(x)=4x
5 0
2 years ago
Read 2 more answers
Other questions:
  • What is a Reciprical??
    9·2 answers
  • I know he is incorrect but I just can’t say why please help
    12·1 answer
  • What is the graetes conman factor of 24,40 and 56
    10·2 answers
  • I need help on #3!!!
    9·2 answers
  • The Red Line in the figure is an altitude of triangle hjl. Using right angle trig and properties of equality, y sin L = x = z si
    13·2 answers
  • The average temperature of New York in the month of July is 76 degrees F and in the month of January is 35 degrees F. What is th
    9·1 answer
  • Help!!!!!!!!!!!!!!!!!!!!!!!!!!
    8·1 answer
  • Are 4(a - 3) and 4a - 7 equivalent expressions?
    12·2 answers
  • Will give correct answer brainliest​
    14·1 answer
  • This graph gives the temperature of Substance B over time.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!