Limits by direct substitution | Limits and continuity | AP Calculus AB | Khan Academy

Sal explains how you can easily find limits of functions at points where the functions are continuous: simply plug in the x-value into the function! Later we will learn how to find limits even when the function isn't continuous.

AP Calculus AB on Khan Academy: Bill Scott uses Khan Academy to teach AP Calculus at Phillips Academy in Andover, Massachusetts, and heÕs part of the teaching team that helped develop Khan AcademyÕs AP lessons. Phillips Academy was one of the first schools to teach AP nearly 60 years ago.

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[rajeshwarijoharle]

You made it so simple Sir... Thank you!

[tanveerhasan]

so in the case of a quadratic equation, the roots of the equation are also its limits?