If 2x^2-3x-m is divisible by (x-3) what is m?

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If 2x^2-3x-m is divisible by (x-3) what is m? [#permalink]

19 Jan 2012, 12:13

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Hi guys, have a question here:

If 2x^2 -3x -m is divisible by (x-3) what is m?

1. -18
2. -9
3.-6
4. 9
5. 18

Thanks!
PS: I got right about the absolute value of the answer, but not its sign. So what wondering what is the rule to follow...

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Re: Algebra [#permalink]

19 Jan 2012, 12:45

Topic moved to PS subforum.

Splendidgirl666 wrote:

Since x-3 is a factor of 2x^2-3x-m, then it can be factored as (x-3)(2x+k) (notice we used 2x in the second factor as we need to get 2x^2)--> 2x^2-3x-m=(x-3)(2x+k)=2x^2-(6-k)x-3k --> 6-k=3 --> k=3 --> m=3k=9.

Answer: D.

Factoring Quadratics: http://www.purplemath.com/modules/factquad.htm

Solving Quadratic Equations: http://www.purplemath.com/modules/solvquad.htm

Hope it helps.

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Please post DS questions in the DS subforum: gmat-data-sufficiency-ds-141/

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Intern

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Re: If 2x^2-3x-m is divisible by (x-3) what is m? [#permalink]

19 Jan 2012, 12:52

Yes, thanks! Will make sure to post questions in the right place next time!

Re: If 2x^2-3x-m is divisible by (x-3) what is m? [#permalink] 19 Jan 2012, 12:52

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If 2x^2-3x-m is divisible by (x-3) what is m?

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If 2x^2-3x-m is divisible by (x-3) what is m?

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