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
Romashka [77]
3 years ago
13

Given that f(x) = x^2 + 4x, evaluate f(-2)

Mathematics
2 answers:
atroni [7]3 years ago
8 0
Hi there!

To find f(-2), we need to plug in the value x = -2 into the equation.

f( - 2) = ( - 2) {}^{2}  + 4 \times  - 2 = 4 - 8 =  - 4
Remember that multiplying a negative by a positive ends up with a positive.

~ Hope this helps you!
vovangra [49]3 years ago
3 0
Hi there!

• f(x) = x² + 4x

• Then,
For finding th' value of f(-2). Substitute " -2 " in place of " x "

f(-2) = (-2)² + 4 × - 2

Exponents first. Accr'ding to P.E.M.D.A.S.

f(-2) = 4 + 4 × - 2

f(-2) = 4 + (-8)

f(-2) = 4 - 8

f(-2) = - 4

Hence, f(-2) = - 4

~ Hope it helps!
You might be interested in
Pooja's plant began sprouting 222 days before Pooja bought it, and she had it for 989898 days until it died. At its tallest, the
MakcuM [25]

Answer:

Step-by-step explanation:

Given:

function h(t) models the height of Pooja's plant (in cm) where

t is the number of days after she bought it.

Now we have to find about which number type is more appropriate for the domain of h.

That means what values can be taken by the variable "t".

As per the questions, t represents number of days not the hours so it will not be in decimal or fraction value. It can only use integer values for the number of days. like 1, 2, 3 ...,n  

Now as the time is counted after she bought the plant then number of days will be positive.  

Hence answer for the type of domain can be positive integers or you can say integers greater than or equal to 0.

5 0
4 years ago
Read 2 more answers
Can someone help please
myrzilka [38]
<h3>Answer:   15x^(7/3) - 8x^(7/4) + x + 9000</h3>

=========================================================

Explanation:

If you know the cost function C(x), to find the marginal cost, we apply the derivative.

Marginal cost = derivative of cost function

Marginal cost = C ' (x)

Since we're given the marginal cost, we'll apply the antiderivative (aka integral) to figure out what C(x) is. This reverses the process described above.

\text{Cost} = \text{antiderivative of marginal cost}\\\\\displaystyle C(x) = \int \left(35x^{4/3} - 14x^{3/4} + 1\right)dx\\\\

C(x) = \frac{1}{1+4/3}*35x^{4/3+1} - \frac{1}{1+3/4}*14x^{3/4+1} + x + D\\\\C(x) = \frac{1}{7/3}*35x^{7/3} - \frac{1}{7/4}*14x^{7/4} + x + D\\\\C(x) = \frac{3}{7}*35x^{7/3} - \frac{4}{7}*14x^{7/4} + x + D\\\\C(x) = 15x^{7/3} - 8x^{7/4} + x + D\\\\

D represents a fixed constant. I would have used C as the constant of integration, but it's already taken by the cost function C(x).

To determine the value of D, we plug in x = 0 and C(x) = 9000. This is because we're told the fixed costs are $9000. This means that when x = 0 units are made, you still have $9000 in costs to pay. This is the initial value. You'll find that all of this leads to D = 9000 because everything else zeros out.

Therefore, we go from this

C(x) = 15x^{7/3} - 8x^{7/4} + x + D\\\\

to this

C(x) = 15x^{7/3} - 8x^{7/4} + x + 9000\\\\

which is the final answer.

3 0
2 years ago
Using the even points the time in the slope (8,1) and (8,4)
VikaD [51]
Look up online "equation calculator" and it should be the first one to appear, "Symbolab" supper easy way to help you with problems!
6 0
4 years ago
Read 2 more answers
Does any one knows the scale factor?
Black_prince [1.1K]
Yes in science it’s the scale factor of the division barns end. Dive o Ebro dodo ooo
Hey jm correct answer
6 0
3 years ago
Someone please help me. ASAP
DENIUS [597]

Answer:

x = 6

Step-by-step explanation:

we both know you dont wanna know how you just want the answer

6 0
3 years ago
Read 2 more answers
Other questions:
  • Trisha and Byron are washing and vacuuming cars to raise money for a class trip. Trisha raised $38 washington 5 cars and vacuumi
    12·1 answer
  • After making a Deposit puja had $264 in her savings account she noticed that if she added $26 to mount originally in the account
    14·1 answer
  • Does 7/13 have a lowest form? if so what is the lowest form of 7/13.
    5·1 answer
  • Solve for the specified variable c=1/6rt for r
    15·1 answer
  • A dolphin jumped from 5 feet below the surface of the sea. Jane wrote −5 to represent the depth from which the dolphin jumped. W
    7·1 answer
  • Which equation can be used to solve this problem. 495 is 55 percent of what?
    15·2 answers
  • Please help me with this!! (Look at the photo I attached) please help me I am confused!!
    5·2 answers
  • 5. ¿Cuál es la expresión algebraica que representa el área de la siguiente figura?
    8·1 answer
  • Hiiiiiiiiiiiiiiiiiiii my frndz give me the answer3x/4-2y/3=5<br>2x/5+3y/5=17<br>​
    11·1 answer
  • solve the equation x +4x-7=0 by completing the square. give your answers correct to two decimal places
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!