Tangent to parabola y² = 4ax at a point (yy₁ = 2a(x+x₁))

jee-mainjee-advanced

yy₁ = 2a(x+x₁)

What each symbol means

Symbol	What it stands for
a	Parameter
(x_1,y_1)	Point on parabola

When to use this

Point satisfies y₁²=4ax₁.