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
ANEK [815]
3 years ago
13

Solve: 2x2-x = 21 {-7/2,3} {-3, 7/2}​

Mathematics
1 answer:
Sergio039 [100]3 years ago
4 0

Answer:

The answer is (-3,7/2)

Step-by-step explanation:

2 {x}^{2}  - x - 21 = 0 \\ (2x - 7)(x + 3) = 0 \\ 2x - 7 = 0 \:  \:  \: or \:  \: x + 3 = 0 \\ x =  \frac{7}{2}  \:  \: and \: x =  - 3

I am a math teacher If you need any explanation you can communicate with me on Whats on this number +201557831028

You might be interested in
Expand and simplify (x-2)(2x+4)
d1i1m1o1n [39]

Answer:

2 {x}^{2}  - 8

hope it's helpful ❤❤❤

THANK YOU.

7 0
3 years ago
Read 2 more answers
The total surface area of a cuboid is 112cm^2. find the value of x. values given: 10cm and 2cm.
Tatiana [17]

Answer:

x= 5.6

Step-by-step explanation:

we will need to put the information we currently have into an equation:

10•2•x= 112

then multiply 10•2 which equals 20...then the equation wil turn out like this:

20•x=112

now you will isolate the x... but how?? dividing 20 by itslef.. cancelling it out, and if you do one thing to the other side of the equation, you have to do it to the other...

20/20•x=112/20

you will end up with x= 122/20

you can use a calculator for this step, but  to practice long division... (check the screen shot thingie)

hope this helped !! ^^

6 0
3 years ago
HELP HELP HELP PLS :(
Sphinxa [80]
Its 216 square feet because 24 x 18 / 2 = 216 (divided by two because its a triangle)
7 0
3 years ago
Read 2 more answers
12 ft 9 in <br>08ft 10in<br>+11ft 4in​
Jobisdone [24]

Answer:

what is the question?

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
For how many minutes did Lynn run at a greater speed than Kael? 12 17 23 28.
Archy [21]

Answer:

<u><em>28 minutes.</em></u>

Step-by-step explanation:

We can see from our graph that 12 minutes after starting the race Lynn left Kael behind and he ran at a greater speed till the race ended after 40 minutes.

To find total number of minutes Lynn ran faster than Kael we will subtract 12 from 40.

Therefore, Lynn ran at a greater speed than Kael for <u><em>28 minutes.</em></u>

4 0
3 years ago
Other questions:
  • he original price of a tractor was $45,000. The price of the tractor decreases at a steady rate of 8.3% per year. What is the va
    12·1 answer
  • Find an equation of the tangent line to the curve at the given point. y=secx (pi/3,2)
    7·1 answer
  • What is 2 over 100 and x over 400. What is x
    10·2 answers
  • write sixty-nine million fifty-eight thousand, two hundred nineteen and three hundredths in standard form show your work will ma
    12·1 answer
  • X2 = 169 solve for x​
    14·2 answers
  • How do I solve 2x^2-32=0 using the square root method?
    10·2 answers
  • My brothers and sister, i need help asap
    13·1 answer
  • ¿Los números decimales periódicos (puros o mixtos) son naturales? ¿Son enteros?
    15·1 answer
  • Choose the student with the correct answer. Pls Help ;-;
    15·1 answer
  • Micheal models an experiment. He places a model car on a tramp that can be adjusted to different heights. Each time the model ca
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!