Question:
What is focus in hyperbola
Answer:
A hyperbola is the locus of a point in a plane which moves in the plane in such a way that the ratio of its distance from
a fixed point (called focus) in the same plane to its distance from a fixed line(called directrix) is always constant which is
always greater than unity.
The equation of hyperbola is
x2 /a2 - y2 /b2 = 1
The points (ae, 0) and (-ae, 0) are the foci of the hyperbola.
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