Teacher2Teacher 
Q&A #202 
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From: Don Bellairs <bellairsd@yahoo.com> 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 xintercepts 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? Thanks, Don
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