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
Delicious77 [7]
3 years ago
6

Evaluate the function: f(x)=x2+2x, find f(−1)

Mathematics
1 answer:
Elena-2011 [213]3 years ago
7 0

Answer:

f( - 1) =  - 1

Step-by-step explanation:

f(x) =  {x}^{2}  + 2x

<u>Substitute</u><u> </u><u>x</u><u> </u><u>=</u><u> </u><u>-</u><u>1</u><u> </u><u>in</u><u> </u><u>the</u><u> </u><u>equation</u><u>.</u><u> </u>

f( - 1) =  {( - 1)}^{2}  + 2( - 1) \\ f( - 1) = 1 - 2 \\ f( - 1) =  - 1

You might be interested in
A 2-column table with 6 rows. The first column is labeled x with entries negative 4, negative 2, 0, 2, 4, 6. The second column i
Elina [12.6K]

Answer:

Option C.

Step-by-step explanation:

The given table is

x   f(x)

-4    0

-2    2

0    8

2    2

4    0

6   -2

A graph of a function intersect x-axis if the function contains the points whose y-coordinate is 0.

From the given table it is clear that the value of f(x) is 0 at x=-4 and x=4. It means, the continuous function intersect the x-axis at two point (-4,0) and (4,0).

Therefore, the correct option is C.

8 0
3 years ago
Read 2 more answers
How does one do math?
frez [133]
"The only way to learn mathematics is to do mathematics."
-Paul Halmos
8 0
4 years ago
40 miners need to ride the elevator to the bottom of the mine. The elevator can hold 9 miners at a time. How many miners will be
BartSMP [9]

Answer:

the answer is 4

Step-by-step explanation:

5 0
3 years ago
Solve x -9 = 8 HELP!!!!! I am dead over here help me!!!!
kumpel [21]

Answer:

x=17

Step-by-step explanation:

x-9=8

add nine on both sides

x-9+9=8+9

the nines on the side with the x cancel each other

x=17

3 0
3 years ago
This net can be folded to make a square pyramid. what is the surface area of the pyramid
givi [52]

Answer:  

85in^2

Step-by-step explanation:

to find the surface area we need to find the followng areas:  

  • area of the square  
  • area of a triangle and multiply it by 4 (because there are 4 triangles)

And once we have those areas, we add them to find the surface area.

Area of the square:

the formula to find the area of a square is:

a_{square}=l^2

where l is the length of the side: l=5in

thus the area of the square is:

a_{square}=(5in)^2

a_{square}=25in^2

Area of the triangles:

the are of 1 triangle is given by

a_{triangle} =\frac{b*h}{2}

where b is the base of the triangle: b=5in (the base of the triangle is the side of the square)

and h is the height of the triangle: h=6in

thus, the area of 1 triangle is:

a_{triangle} =\frac{(5in)*(6in)}{2}

a_{triangle} =\frac{30in^2}{2}

a_{triangle} =15in^2

the area of the 4 triangles is (we multiply by 4):

a_{4-triangles}=4(15in^2)

a_{4-triangles}=60in^2

finally we add the area of the square and the area of the 4 triangles to find the total surface area:

Surface=25in^2+60in^2

Surface=85in^2

8 0
2 years ago
Other questions:
  • Mia's cat weighs 13 pounds ,7 ounces .about what is that weight in kilograms ?
    9·2 answers
  • Marys employee benefits include family healthcare. She contributes 22% of the cost. Mary gets paid biweekly and $170.00 is taken
    12·1 answer
  • SHOW STEPS AND SIMPLIFY! 30 POINTS!!!
    12·1 answer
  • Write the decimal place name for each of the underlined digits. a. .423 b. .32678 c. .4524 d. .3006
    14·2 answers
  • An outdoor spigot at the school has a leak and is dripping water. A student counted eighty drops of water in five minutes and no
    7·1 answer
  • Draw an example of a composite figure that has a volume between 750 cubic inches and 900 cubic inches
    12·1 answer
  • Convert 8.45km to metres.​
    7·2 answers
  • What the awnser 2/4 x 4/8
    7·2 answers
  • PLEASE LOOK AT PICURE!!! I WILL MARM BRAINIEST TO WHOEVER IS CORRECT!!!
    6·2 answers
  • What is the greatest common factor of 14, 28 and 42?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!