Limits by factoring | Limits and continuity | AP Calculus AB | Khan Academy
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- čas přidán 21. 01. 2013
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Sal finds the limit of (x_+x-6)/(x-2) at x=2 by factoring and simplifying the expression.
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He's using SmoothDraw with a Wacom tablet
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.
Had me confused there too
How do you arrive at that conclusion. In factoring, you usually want to account for all values of x, so (x+3)(x-2) doesn't seem to be a good factorization of x^2+x-6. If you try to simplify that through FOIL then you arrive at x^2-2x+3x-6, not the same answer. What formula is used to derive the rule "a number whose sum is 1 and whose product is -3".
thanks this was confusing me
Good luck may speed be with you on your future endeavor.
2:01 what happened to that voice change?😂
how did you know the y value for x =/ 2 was
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.
Hey sal, i wonder, what program your using. Because im trying to make videos too.
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?
plz tell me you figured this out by now im dying to know lol
@@thepicmaster1385 hahaha sorry no idea, I never came back to it. I pass the torch on to you.
@@TehMaxLightning oh god im failing hahahah
thnx man, but how to record it?
can someone help me how to get this on-screen calculator?
How did he know the y intercept is 3?
My First first Comment :)
why don't u use the de l'Hospital?
Jajajajjaja vine buscando nivel y contre el nivel más difícil
You should really do Let's Plays of Minecraft. You have the perfect voice for it and you are smart, which is good for Minecraft.
True
sal how come I cant find these videos in playlist? Can you add them in your calc playlist?
aughhhhhhhhhhhhhhhhhhhhhhhh
Sorry Bro you were about a 1 minute too late :(