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
statuscvo [17]
3 years ago
6

The equation x^3+x^2+ax-4=0 has one root equal to -2. Find the value of a.​

Mathematics
1 answer:
Vedmedyk [2.9K]3 years ago
5 0

Answer:

a = - 4

Step-by-step explanation:

Given x = - 2 is a root then f(- 2) = 0

f(x) = x³ + x² + ax - 4, thus

f(- 2) = (- 2)³ + (- 2)² - 2a - 4 = 0, that is

f(- 2) = - 8 + 4 - 2a - 4 = 0, thus

- 8 - 2a = 0 ( add 8 to both sides )

- 2a = 8 ( divide both sides by - 2 )

a = - 4

You might be interested in
Alright I need answers for number 41-47 I need This done by Tuesday
ololo11 [35]
Gjddursjgdgjkydkdybf
8 0
3 years ago
Read 2 more answers
The double number line shows that 4 bottles of water cost 10 dollars at a music festival ​
pickupchik [31]

Answer:

That means that each water is $2.50, das crazy tho

Step-by-step explanation:

4 0
3 years ago
X + x + x = 54<br> What’s the answer for this
Oliga [24]

Answer:

x = 18

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

x+x+x=54

(x+x+x)=54(Combine Like Terms)

3x=54

3x=54

Step 2: Divide both sides by 3.

3x  3 = 54

3 x=18

Answer:

x=18

8 0
3 years ago
Read 2 more answers
Explain how soil is a system by yourself dont use internet<br> brainliest if u have self explanation
Allushta [10]

Answer:

They are critical ecosystem service providers for the sustenance of humanity.The soil system is a dynamic ecosystem that has inputs, outputs, storages and flows. The quality of soil influences the primary productivity of an area..

Step-by-step explanation:

mark me the Brainliest pls

7 0
2 years ago
A ball is dropped from a treetop 256 feet above the ground. How long does it take to hit the ground? (s = 16t2)
White raven [17]
4 seconds, so whatever the letter is for the answer I have provided, select it
5 0
3 years ago
Read 2 more answers
Other questions:
  • Lo que es 8 metros aumentado dividido por 40.
    9·1 answer
  • 5m-3/63 = 9/21 solve for m
    15·2 answers
  • Find the approximate perimeter of rectangle FOUR plotted below.
    9·1 answer
  • 5. Three friends recorded the lengths of the hopscotch paths they made in different units. Casey's length was 94 ft. Jasmin's le
    5·1 answer
  • Four more than three times a number, is less than 30. Which of the following is not a solution?
    9·2 answers
  • Please some help me fast
    8·1 answer
  • -9(4+x)&gt;-126 help me find what x is? thank you
    9·2 answers
  • In the typing world, 80 words per 5 minutes is considered acceptable.
    8·2 answers
  • Find the length of the segment with the endpoints (3,-8) and (5,-2).
    15·1 answer
  • PLEASE HELP I WILL MARK BRAINLIEST
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!