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
sveta [45]
2 years ago
9

Solve the equation 4n2 − 16n − 84 = 0 by completing the square.

Mathematics
1 answer:
melomori [17]2 years ago
8 0

4n² - 16n - 84 = 0

Multiply both sides by 1/4 :

n² - 4n - 21 = 0

Add 21 to both sides:

n² - 4n = 21

Complete the square by adding 4 to both sides:

n² - 4n + 4 = 25

(n - 2)² = 25

Solve for n :

n - 2 = ± √25

n - 2 = ± 5

n = 2 ± 5

Then n = 2 + 5 = 7 or n = 2 - 5 = -3.

You might be interested in
The scale factor is 5:1 so the scale drawing is____ times the size of the object
aliya0001 [1]
It is 5 times the size of the object
3 0
3 years ago
Find the slope of aline parallel to each given line
Andreas93 [3]

Answer:

d

Step-by-step explanation:

7 0
3 years ago
8. A dolphin is traveling 5.5 meters
navik [9.2K]
Distance = final height - depthOFdolphin
Distance = 2.4 - (-5.5)
Distance = 2.4 + 5.5
Distance = 7.9 meters
8 0
3 years ago
Ms.Johnson wants to buy donuts for her science class, she wants to buy 8 glazed donuts, 12 chocolate donuts, and 16 jelly donuts
arsen [322]

Answer:

8/36

Step-by-step explanation:

4 0
2 years ago
The linear distance around the border of a 2-dimensional shape is:
NeX [460]

Answer:

A) Perimeter

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Other questions:
  • What did the Selective Service Act mean for American men
    7·1 answer
  • Adventura needs to know animals weight in kilograms is 20 pounds is about 9 kilograms and a dog weighs 30 pounds use a ratio tab
    13·1 answer
  • The sum of fourteen and a number added to the product of thirteen and the number is
    7·1 answer
  • ​In a sample of 800 U.S.​ adults, 199 think that most celebrities are good role models. Two Two U.S. adults are selected at rand
    12·1 answer
  • A scale drawing of a door is 2 cm high. If the scale is 1 cm = 4 meters, what is the actual height of the door?
    12·2 answers
  • 55 minutes to 4 hours write the ratio as a fraction in lowest terms answer
    8·1 answer
  • a fish tank is in the shape of a cube the. volume of the fish tank is 64 cubic feet. What is the area of one face of the fish ta
    7·2 answers
  • A)Loss is denoted by a negative integer and profit is denoted by a positive integer. A
    14·1 answer
  • Someone help me out please
    6·1 answer
  • What is the rate of change for f(x) = 4 sin
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!