Q&A #202

Teachers' Lounge Discussion: Graphing linear inequalities

T2T || FAQ || Ask T2T || Teachers' Lounge || Browse || Search || T2T Associates || About T2T

View entire discussion
[<< prev] [ next >>]

From: Don Bellairs

To: Teacher2Teacher Public Discussion
Date: 2007071212:05:27
Subject: discriminants and roots?

Please excuse my neediness: I am an English teacher/counselor making
ends meet by tutoring a graduating HS senior.  We are stuck on some
math stuff and I don't know how to research it...Found your site.

Briefly, 3 questions:

Why does a quadratic equation have one soution if the discriminant is
zero.  I don't know how to explain that.

What does a parabola with 2 x-intercepts look like in equation form?

For which value of k does kx2 - 10x + 25k = 0     -1, 2, 3, 5 or 10?

Thanks.  We are finishing a college prep course and I can't explain
these questions...

Also, our text book refers to "roots" sometimes and "solutions" at
others.  Are these interchangeable terms?


Post a reply to this message
Post a related public discussion message
Ask Teacher2Teacher a new question

[Privacy Policy] [Terms of Use]

Math Forum Home || The Math Library || Quick Reference || Math Forum Search

Teacher2Teacher - T2T ®
© 1994- The Math Forum at NCTM. All rights reserved.