A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
I am so desperate, please help! i have to factor this equation. 21r^2  rs  2s^2
As well as solve this one in any way: x^421x^2100=0
Please! The questions are due in 1015 minutes!
anonymous
 4 years ago
I am so desperate, please help! i have to factor this equation. 21r^2  rs  2s^2 As well as solve this one in any way: x^421x^2100=0 Please! The questions are due in 1015 minutes!

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0(3rs) (7r+2s) for the first one. (x5) (x+5) (x^2+4) = 0 x = 5 and x = 5 for the second one. :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0tlau, how did you get the answer?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Factor by inspection. Valid method.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0x^4 21x^2 100 =0 note x^2=y so than y^2 21y 100=0 y_1,_2=(21+/ sqrt(441+400))/2=(21+/ sqrt(841))/2 =

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0wouldn't the answer to the second one also be 4 as well?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0You can't square root a negative number. Have you done imaginary numbers?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0x^2 = 4 No real number x can be squared to get 4. Any number squared positive or negative is positive.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I did 2 years ago. i'm having to relearn everything as I am starting precal, but now I understand. Thank you very much!
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.