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Re: New Algebra Set!!!
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18 Mar 2013, 08:37
5. I have taken a longer approach, there should be a better solution.
x^2 + 2x -15 = -m
x^2 + 5x - 3x - 15 = -m
(x+5)(x-3) = -m
x will have integer values, since m is also an integer.
Putting positive values for x such as ( 1, 2....) we will get values for m which lies between -10 and 10, they are -9, 0 and 7.
We will get same result for negative values of x, the equation is a parabola, it will be symmetric
Hence the probability is 1/3
Answer is B.