Question

1.Factorise using the remainder theorem 2x^3 - 9x^2 - 11x + 30.
2.Factorise : (2y+x)^2(y-2x)+(2x+y)^2(2x-y)

Answer 1

plzz answer..>!!:((

Answer 2

@jdoe0001 plzz cn u answer any 1.?? plzz

Answer 3

hmmm, do you know what the remainder theorem is? because if the exercises asks for it,... it's assume you're supposed to know it already :S

Answer 4

ik wat is remainder theoram..bt i dk hw to do dis 1.. HELP:(
;9

Answer 5

well,... I looked and looked, and I don't think the remainder ALONE will do it
the way I've do it is using the "rational root test"
and the rational root test uses the remainder theorem but just a bit

Answer 6

k..cn u shw hw??

Answer 7

@jdoe0001 cn u help me??

Answer 8

http://www.youtube.com/watch?v=GTx-rXTQg1o <---

Answer 9

check that, let me know for anything confusing :)

Answer 10

do u noe hw to do d second question?

Answer 11

well, the second is just factoring
you have 2 polynomials being + ADDED, so the way to factor them is to get "common factor" on both

Answer 12

cn u shw hw??plzz step by step

Answer 13

ok, lemme give you.... a quick example

ab + bc

what would be the common factor there? :)

Answer 14

b

Answer 15

yeah, so lemme show you the one you have there now
\(\bf \color{blue}{(2y+x)^2}(y-2x)+\color{blue}{(2x+y)^2}(2x-y)\)

see any common factors?

Answer 16

2

Answer 17

so, you take out the common factors out

Answer 18

k den

Answer 19

then, that's about it on factoring, you end up with several "factors" or item multiplying each other

Answer 20

wat do u gt?

Answer 21

idk hw to do it..cn u shw fully hw to do dis equation??

Answer 22

in the previous example

ab + bc # common factor is "b"
so if we take out "b", that is, we take away "b" from "ab" and leave only "a" by its lonesome
and take away "b" from "bc" and leave "c" all by its lonesome too
we're left with \(\bf b(a+c)\)

Answer 23

so you'd do the same with any polynomial to get a common factor

Answer 24

some are just longer than just 2 terms, it could be any amount of terms

Answer 25

ya...i gt dat..bt hw do u do ni dis equation is it
2[(y+x)(y-x)+(x+y)(x-y)]
=2(y+x+y)
=2y^2x

Answer 26

u cn do cancellation..rie??

Answer 27

\(\bf (2y+x)^2(y-2x)+(2x+y)^2(2x-y)\\
\textit{let's call }(2y+x)^2 = a\\
a(y-2x)+a(2x-y) \implies a[(y-2x)+(2x-y) ]\\ \implies (2y+x)^2[(y-2x)+(2x-y) ]\)

Answer 28

ohhk

Answer 29

so d final anser is dat??

Answer 30

on another note, if you were to expand say -(2x -y) what would it look like?

Answer 31

i hv another questin

Answer 32

can't say right off, might be better to post anew so we all can see and help and revise each other

Answer 33

hmmk