Hi,

Since the line does not cut the X axis, it is an INEQUALITY, So, you should look for the answer choices by which the equation do not answer.

Solve the inequality, substituting 0,-3, and 9 in place of d. you can easily find out that you cannot find possible value for the equation when d= 0 or -3. So these are the answers because it is an INEQUALITY. Substituting d=9, you reach 

Hi,

Since the line does not cut the X axis, it is an INEQUALITY, So, you should look for the answer choices by which the equation do not answer.

Solve the inequality  substituting 0,-3, and 9 in place of d. you can easily find out that you cannot find possible value for the equation when d= 0 or -3. So  because it is an INEQUALITY, I & II are the answers. Substituting d=9, you reach   x=1.145 , -1.145 which are possible values. Thus, “C” is the correct answer choice.

Good luck

ABDI

 

--- On Sat, 7/11/09, 4GMAT - GMAT Classes, Discussion Forums <groups@...> wrote:

From: 4GMAT - GMAT Classes, Discussion Forums <groups@...>
Subject: [4gmat] QOTW : Quadratic Equations
To: 4gmat@yahoogroups.com
Cc: 4gmat@googlegroups.com
Date: Saturday, July 11, 2009, 1:48 AM

Hi

 

If y = x^2 + dx + 9 does not cut the x-axis, then which of the following could be a possible value of d?
I. 0
II. -3
III. 9

 

A.  III only
B. II only
C. I and II only
D. II and III only
E. I and III only

You could post your answer to this question by replying to this mail or by participating in the discussion at    

http://mba-forum. 4gmat.com/ qotw-quadratic- equations- t360.html

 

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