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# If 2x^2-3x-m is divisible by x-3, then m= -18 -9 -6 9 18

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Manager
Joined: 25 Feb 2008
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If 2x^2-3x-m is divisible by x-3, then m= -18 -9 -6 9 18 [#permalink]

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21 Mar 2008, 06:15
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If 2x^2-3x-m is divisible by x-3, then m=
-18
-9
-6
9
18
Optional: time you spend on this question
Manager
Joined: 20 Aug 2007
Posts: 65
Followers: 1

Kudos [?]: 12 [1] , given: 0

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21 Mar 2008, 06:55
1
KUDOS
Capthan wrote:
If 2x^2-3x-m is divisible by x-3, then m=
-18
-9
-6
9
18
Optional: time you spend on this question

equate 2x^2-3x-m = 0 and substitute x=3
m=9
Manager
Joined: 28 Sep 2007
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21 Mar 2008, 08:16
why is it that you can substitute x=3. I know you got that from the divisible by x-3 and carried over the 3, but how did you know to do that?
Manager
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21 Mar 2008, 08:40
jingy77 wrote:
why is it that you can substitute x=3. I know you got that from the divisible by x-3 and carried over the 3, but how did you know to do that?

if 2x^2-3x-m is divisible by x-3, it means that x-3 multiplies with something will be equal to sx^2-3x-m

when you solve ax^2+bx+c question, you normally equate it with 0 and find value of x by finding factors

so in this case, i go with this

2x^2-3x-m = (x-3) * A = 0
this means than x=3 must be one of the solutions of equation
so i choose o substitute that and find m =9
Re: x-3   [#permalink] 21 Mar 2008, 08:40
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