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Re: (x + 7) is a factor in x^2 - mx - 56. What is the value of m [#permalink]

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24 Oct 2014, 20:37

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Re: (x + 7) is a factor in x^2 - mx - 56. What is the value of m [#permalink]

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28 May 2016, 23:37

l got the same answer. lt's not stated in the question stem that x^2 - mx - 56 = 0. Based on what information do we know (x^2 - mx - 56) equals to zero? Could someone please clarify?

l got the same answer. lt's not stated in the question stem that x^2 - mx - 56 = 0. Based on what information do we know (x^2 - mx - 56) equals to zero? Could someone please clarify?

Regards, Curious mind.

Hi,

x^2-mx-56 can be any value depending on value of x..... this equation is that of PARABOLA, so you will get a parabola when you draw a graph of it...

Just remember for GMAT that but when we factor or find roots, we work for ONLY those values of x at which the equation gives us a 0 value..

That is why when we are factoring the equation here we take the equation to be equal to 0...

so If I tell you the speed of something is dependent on x^2-15x+56 and then ask you speed at say 9h second, substitute x as 9 and find the answer.. But if I ask you at what values will the speed be 0, put the equation as 0 and find values of x..
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Re: (x + 7) is a factor in x^2 - mx - 56. What is the value of m [#permalink]

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07 Jun 2017, 22:27

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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(x + 7) is a factor in x^2 - mx - 56. What is the value of m?

A. 1 B. 8 C. 14 D. 15 E. 16

Since (x + 7) is a factor of x^2 - mx - 56, we know that x = -7 will satisfy the equation x^2 - mx - 56 = 0; therefore, we can substitute -7 for x and we have:

(-7)^2 - 7m - 56 = 0

49 - 7m = 56

-7m = -7

m = 1

Answer: A
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