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Factorise −2x^3 − 7x^2 + 5x + 4

knowing that (x+4) factorises without remainders
Original post by Mina_
knowing that (x+4) factorises without remainders


so is the question -2x times 3-7x times 2+ 5x+ 4?
Original post by Mina_
oh Iqbal youre so hilarious


LOOOOOOOOOOOL Did you click on it
Original post by x-bhakti-patel
so is the question -2x times 3-7x times 2+ 5x+ 4?


No. im afraid not, and i hope you don't take maths. :biggrin:
Reply 4
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Zacken
22
Original post by Mina_
knowing that (x+4) factorises without remainders


Long divide x+4 out to get the remaining quadratic.
Do long division with (x+4) then factorise the quotient.
Reply 6
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Mina_
OP
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Original post by Vikingninja
Do long division with (x+4) then factorise the quotient.


Already have, only to get (2x-1)(1-x)(x+4)
which isnt the right answer on the mark scheme so I wanted to see what other people did
Original post by Mina_
Already have, only to get (2x-1)(1-x)(x+4)
which isnt the right answer on the mark scheme so I wanted to see what other people did


Can you show what you got from the long division?
Reply 8
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Mina_
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8
Original post by Iqbal Tutt
LOOOOOOOOOOOL Did you click on it


My message is being checked by a moderator now because of you, and nah already knew what it was :wink:
Original post by Luiswright31
No. im afraid not, and i hope you don't take maths. :biggrin:


I did it for GCSE and got a C, but no if ur asking if i take maths for A- Level then i am afraid not. :smile:
Reply 10
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Mina_
OP
8
Original post by Vikingninja
Can you show what you got from the long division?


This is what I did
13220047_1303206939693535_1649533188_n.jpg29.7KB
Original post by Mina_
This is what I did


not sure where that -1 with 2x came from. Those two brackets would give -2x^2 + 3x -1.
(edited 7 years ago)
Reply 12
Avatar for kolento
kolento
I got -2x^2+x+1 from dividing which factorises to (-2x-1)(x-1)

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