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In the equation x^2+bx+c=0, b and c are constants, and x is

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In the equation x^2+bx+c=0, b and c are constants, and x is [#permalink] New post 06 Mar 2014, 20:26
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In the equation \(x^2+bx+c=0\), b and c are constants, and x is a variable. If m and k are the roots of \(x^2+bx+c=0\), then m−k=?

(1) c=−10
(2) b=3
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Re: In the equation x^2+bx+c=0, b and c are constants, and x is [#permalink] New post 06 Mar 2014, 23:07
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idinuv wrote:
In the equation \(x^2+bx+c=0\), b and c are constants, and x is a variable. If m and k are the roots of \(x^2+bx+c=0\), then m−k=?

(1) c=−10
(2) b=3


Even when we combine the statements we get \(x^2+3x-10=0\) --> \((x+5)(x-2)=0\) --> \(x=-5\) or \(x=2\) --> m and k are -5 and 2, but we don't know which one is which --> m-k is either -5-2=-7 or 2-(-5) = 7.

Answer: E.
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Re: In the equation x^2+bx+c=0, b and c are constants, and x is   [#permalink] 06 Mar 2014, 23:07
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In the equation x^2+bx+c=0, b and c are constants, and x is

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