|Dec11-11, 02:59 AM||#1|
Okay so I've been teaching myself (with the aid of the mighty internet & several friends) algebra & now calculus. I have found that I didn't do too good at high school for various reasons. Some good...some not good. Anyway...
I have a (what is probably a basic question) about factoring limit questions. I understand that with an equation like below (which results in 0, you need to factor it)
Lim x^2 -5x - 6
x^2 - 4
factored it works out to (x-3)(x-2).
I can manage that. What is the approach taken when you have something like
Lim x^2 + 3x -24
x^2 + 8
I don't know what to do in a situation like this, I don't know how to break it into a (x a)(x b) situation. I hope this thread isn't looked at & thought 'what a twit' I should say that I am aware of the quadratic equation............
|Dec11-11, 04:31 AM||#2|
In this problem you can actually just substitute [itex]x = 4 [/itex] since the result is defined (no 0 in the denominator or an infinity anywhere) :)
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