testing header
Math Goodies is a free math help portal for students, teachers, and parents.
Free Math
Interactive Math Goodies Software

Buy Math Goodies Software
testing left nav
Math Goodies on facebook

Math Goodies Blog
Math Forums @ Math Goodies
Math Forums @ Math Goodies
Home | Profile | Register | Active Topics | Members | Search | FAQ
Save Password
Forgot your Password?

 All Forums
 Homework Help Forums
 Standardized Test Preparation Help
 SAT Question #5
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

Senior Member

28 Posts

Posted - 09/25/2008 :  08:52:23  Show Profile  Reply with Quote
The following information was given for the following problem:
mx + nx + 16 = 0

In the quadratic equation above, m and n are nonzero numbers. If the equation has only one solution, which of the following is equal to m in terms of n?

The following answers given were:

(a) m = n/2

(b) m = n/4

(c) m = n/16

(d) m = n/16

(e) m = n/ 64

I need an explanation on how to solve this type of problem. Any assistance would be greatly appreciated.
Go to Top of Page

Advanced Member

5634 Posts

Posted - 09/25/2008 :  11:17:53  Show Profile  Reply with Quote
the general quadratic is ...

y = ax+bx+c

if y = 0, then x = [-b [sqrt(b-4ac)]/(2a)

further, if the quadratic equation has a single solution, then the discriminant, b-4ac, equals 0.

in your problem ...

a = m
b = n
c = 16

work with that info.

Go to Top of Page

Senior Member

28 Posts

Posted - 09/25/2008 :  14:35:01  Show Profile  Reply with Quote
Thanks again Skeeter. I thought about the general equation but for some reason the "m' and "n" threw me for a curve. Thanks again for all your help.
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
Math Forums @ Math Goodies © 2000-2004 Snitz Communications Go To Top Of Page
This page was generated in 0.03 seconds. Snitz Forums 2000
testing footer
About Us | Contact Us | Advertise with Us | Facebook | Blog | Recommend This Page

Copyright © 1998-2015 Mrs. Glosser's Math Goodies. All Rights Reserved.

A Hotchalk/Glam Partner Site - Last Modified 20 Jan 2015