Condition for a Line to Cut the Parabola at Two Points

Rarely Tested

Condition for a Line to Cut the Parabola at Two Points

For:

$$y=mx+c$$

to intersect:

$$y^2=4ax$$

at two distinct real points:

$$mc<a$$

for $$m>0$$.

Usage

- Used to determine whether a given line is a secant of the parabola.

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