Question

PLEASEE HELP: Which

Answer 1

@zepdrix @Nnesha @Vocaloid

Answer 2

@MathleticMagician @math&ing001 @zpupster

Answer 3

@imqwerty i think its the first one?

Answer 4

yea correct (:

Answer 5

@imqwerty Thanks could you help me with a couple more please

Answer 6

yea sure (:

Answer 7

@imqwerty

Answer 8

the polynomial in x with roots say α,β,γ
can be given by-

f(x)=(x-α)(x-β)(x-γ)

(: try to do it now

Answer 9

I think its B but Im not sure

Answer 10

please help

Answer 11

@imqwerty

Answer 12

putting 4,5,-7 in place of α,β,γ in f(x)=(x-α)(x-β)(x-γ) and simplifying we get-

f(x)=(x-4)(x-5)(x-(-7))

did u do this?

Answer 13

yes thanks and I sent you a message!

Answer 14

@imqwerty

Answer 15

i didn't get ur pm :/
this ws the problem with many os users wait a sec ima send to a pm then u tell if u recieved it or not

Answer 16

ok

Answer 17

i sent the message did u get it?

Answer 18

no

Answer 19

Hints:
Use the property of multinomials:
\((x-a)(x-b)(x-c)=x^3-(a+b+c)x^2+(ab+bc+ca)x+abc\)
So if a,b,c are the roots, the constant term =abc, the second coefficient=-(a+b+c).

Answer 20

the message thing is working ):

Answer 21

ok well basically I said I just need the answer lol I have a ton to do and this is taking a while thats what i was saying...

Answer 22

XD

Answer 23

sorry!

Answer 24

A

Answer 25

is it actually?

Answer 26

its ok i can feel ur pain but hey i'll not answer only a few cause its not good

and yes A is correct

Answer 27

ok i understand thanks one more though?? I have to do the rest on my own anyway

Answer 28

ok (: only 1 more

Answer 29

Which of the following is a polynomial with roots 5, 4i, and −4i?

f(x) = x^3 − 5x^2 + 20x − 16
f(x) = x^3 − 5x^2 + 16x − 80
f(x) = x^3 − 20x^2 + 5x − 16
f(x) = x^3 − 16x^2 + 80x − 5

Answer 30

@iwanttogotostanford
It's taking time because you are not learning to solve the the problem.
If you learned how to solve these problems, each one can be solved in 10 seconds.
Read my post and you'll see.

Answer 31

thank you so much!

Answer 32

@mathmate is correct :D

Answer 33

@mathmate I know how to do the problems i don't have time to right now and I have to do a lot more!

Answer 34

This one you can solve in less than 5 seconds! lol

Answer 35

and u shuld learn @mathmate 's trick u can solve such prblms in seconds with it (:

Answer 36

ok whats the trick?n Id love to know

Answer 37

Hints:
Use the property of multinomials:
(x−a)(x−b)(x−c)=x3−(a+b+c)x2+(ab+bc+ca)x+abc
So if a,b,c are the roots, the constant term =-abc, the second coefficient=-(a+b+c).

Take the previous example:
THanks!: Which of the following is a polynomial with roots 4, −5, and 7?

f(x) = x^3 − 6x^2 − 27x + 140
f(x) = x^3 − 6x^2 − 20x + 27
f(x) = x^3 − 20x^2 − 27x + 35
f(x) = x^3 − 20x^2 − 35x + 140
4*(-5)*7 = \(\color{red}{-140}\)
So the answer can be:
f(x) = x^3 − 6x^2 − 27x + 140 or
f(x) = x^3 − 20x^2 − 35x + 140
4+(-5)+7 =\(\color{red}{6}\)
So the answer has to be
\(f(x) = x^3 \color{red}{− 6}x^2 − 27x + \color{red}{140} \)

Answer 38

@imqwerty could you please tell me what the last one is really quick thats all

Answer 39

@zepdrix