anonymous
  • anonymous
help!!!!!!!!!!!!!!!!!!1when the expression x^3+mx^2+nx-5 is divided by x+2 and x+3, the remainder are 2 and 13 respectively. Find the values m and n
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
only m is visible.
anonymous
  • anonymous
then what??
anonymous
  • anonymous
Looks like a typo, Derek. Normally the problem wouldn't be asking for a value of n unless there's a variable n somewhere.

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nincompoop
  • nincompoop
I've seen almost similar problem this morning. learn how to perform long division or synthetic division
anonymous
  • anonymous
what is n ?
anonymous
  • anonymous
sorry, xD had a typo.xDD
anonymous
  • anonymous
now I see.
anonymous
  • anonymous
what now??
anonymous
  • anonymous
|dw:1378300318000:dw| similarly divide by x+3 and form equation in m and n. then solve for m and n
anonymous
  • anonymous
awts,, sorry,, just went to some other thread., xDD
anonymous
  • anonymous
|dw:1378355779479:dw|
anonymous
  • anonymous
after getting the second equation?/?
anonymous
  • anonymous
|dw:1378301749931:dw|
anonymous
  • anonymous
there should be no x^2
anonymous
  • anonymous
It will contain m and n and constants
anonymous
  • anonymous
so what to do??
anonymous
  • anonymous
don't write quotient show remainder as i have done.
anonymous
  • anonymous
|dw:1378356345855:dw|
anonymous
  • anonymous
|dw:1378356367930:dw|
anonymous
  • anonymous
now write 9m-3n-32=13
anonymous
  • anonymous
why 13???
anonymous
  • anonymous
you have writtrn in the question.
anonymous
  • anonymous
ahhhh,,,. xDD
anonymous
  • anonymous
its actually 4m. xDDD
anonymous
  • anonymous
after that??
anonymous
  • anonymous
solve??
anonymous
  • anonymous
how you got 4, it is 9
anonymous
  • anonymous
oh sorry,, da eff with my penmanship.xDD
anonymous
  • anonymous
next??
anonymous
  • anonymous
9m-3n=45 or3m-n=15 now solve these two equations for m and n.
anonymous
  • anonymous
how??
anonymous
  • anonymous
subtract??
anonymous
  • anonymous
4m-2n=15 ...(1) 3m-n=15 ...(2) R.H.S is equal so L.H.S is also equal 4m-2n=3m-n 4m-3m=2n-n m=n from (2) 3m-m=15 2m=15 m=15/2 n=m=15/2
anonymous
  • anonymous
you can solve by substitution or as you thought by subtraction (only for this question) also.
anonymous
  • anonymous
thanks
anonymous
  • anonymous
yw

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