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View Full Version : Quadratics Tricky Question: values of k if graph of why = 2x^2 - 2x + 3k


missgeek
Feb 4, 2010, 05:27 PM
Determine the values of k if the graph of y = 2x^2 - 2x + 3k intersects the x-axis at two distinct points.

galactus
Feb 5, 2010, 05:28 AM
Use the discriminant to see if it has two distinct solutions.
b^{2}-4ac
If the discriminant is greater than 0, then there are two distinct solutions.

So, you need to solve
b^{2}-4a(3k)>0 for k