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Re: (x + 7) is a factor in x^2 - mx - 56. What is the value of m [#permalink]
24 Oct 2014, 20:37
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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.
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..