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How to show that a curve lies above the x-axis?

Hello,
I couldn't figure out how to solve the question below:

The equation of a curve is y = x^2 − 3x + 4.
Show that the whole of the curve lies above the x-axis.

Please help..

by jspake

Sun Dec 09, 2012 6:36 am
Forum: Data Sufficiency
Topic: How to show that a curve lies above the x-axis?
Replies: 6
Views: 18984