Limits by factoring | Limits and continuity | AP Calculus AB | Khan Academy

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Sal finds the limit of (x_+x-6)/(x-2) at x=2 by factoring and simplifying the expression.

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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When he said the product of the two numbers had to equal -6 and the sum of the two numbers had to equal +3, he made a mistake. The sum had to equal 1 and the product had to equal -6.

adjbutler

He's using SmoothDraw with a Wacom tablet

mstsindia

2:01 what happened to that voice change?😂

totoblox

Good luck may speed be with you on your future endeavor.

shiratori

Why is it that we can simplify the original expression and sub the limit in? My point is that we get the new expression from the original expression by simplifying it, as such the two expressions should be identical. However, substituting 2 for x gives undefined in the original expression and gives 5 in the new expression. How does that make sense? Shouldn't we get the same result?

TehMaxLightning

When graduated high school in 1998 things where taught a lot different for ex. foil(first inner outer last) from algebra 1 can not be found on you site. You talk about factoring going back 2 basic algebra 1, but you don't give a link to it for people like me who forgot a few things over a decade of having no need for it. Can you please give a link on your exercises sheet to the relevant information, if it not to much work. Thanks.

josephstein