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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.

jhonyy9
 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!
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