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AP Calculus help +k

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es94
Posts: 291 - Karma: 67
If someone can help me with these, or at least one, i will grant you karma splendor and love you forever.

dont know how to superscript so the carrot is "squared"

the limit of (x+2)^2 -- 9x
                          x              as x approaches 4

the limit of (x^2 -- 1/x) as x approaches 0 FROM THE LEFT

Find the value of c such that the limit exists. x is is approaching 1.  x^2+3x+c
                                                                                                              x-1


muchas gracias
Sep 13 2011 6:53PM
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BILL.COSBY
Posts: 292 - Karma: 5
pi
Sep 13 2011 6:54PM
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BrownBomber
Posts: 675 - Karma: 446
You know you've run out of resources when you turn to newschoolers for your calculus homework
Sep 13 2011 6:58PM
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-NO-
Posts: 39 - Karma: 10
so true, but the first ones 0
Sep 13 2011 6:58PM
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-NO-
Posts: 39 - Karma: 10
Sorry for the dub post but, the second ones positive infiniti and the im not very sure on the third
Sep 13 2011 7:06PM
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ChristianJames
Posts: 214 - Karma: 19
First one just simplify as much as possible the plug in the 4. The second graph it and youl see the asymptote and idk the last one those suck dicks
Sep 13 2011 7:08PM
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iLLbiLLy
Posts: 2865 - Karma: 2,631
haven't done limits in forever but here's a decent tutorial

http://www.analyzemath.com/calculus/limits/find_limits_functions.html

I looked over it a bit and it shouldn't be to hard to figure out
Sep 13 2011 7:11PM
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es94
Posts: 291 - Karma: 67
thanks for the help everybody. and yes its truly a last resort
Sep 13 2011 7:14PM
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iLLbiLLy
Posts: 2865 - Karma: 2,631
or if your want to be a cheater....

http://www.wolframalpha.com/input/?i=limit+x-%3E4+%28%28x%2B2%29^2+-+9x%29%2Fx+

wolframalpha kicks ass
Sep 13 2011 7:15PM
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Slippery_Gypsy
Posts: 124 - Karma: 0
HEY! This is exactly what we're doing in my AP Calc CLass,

but anyways the first one is indeed 0, which can be found pretty easily by graphing.

Both the second and third ones have holes in the graphs, so you gotta solve 'em algebraically,

And I kinda forgot how to do it.... for realz just ask your teacher,

Oh and the second is definitely not infinity don't listen to that b.s. xD
Sep 13 2011 7:15PM
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iLLbiLLy
Posts: 2865 - Karma: 2,631
second one is infinity

http://www.wolframalpha.com/input/?i=limit+x-%3E0-++%28x^2+-+1%2Fx%29
Sep 13 2011 7:18PM
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arandomname
Posts: 1989 - Karma: 18
Third one is c = -4.  The other guy was right about the first two.
Sep 13 2011 7:22PM
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ski93
Posts: 1279 - Karma: 83
Pro tip: wolframalpha.com
Sep 13 2011 7:38PM
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ski93
Posts: 1279 - Karma: 83
sry didn't see this
Sep 13 2011 7:38PM
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Creator
Posts: 1914 - Karma: 87
i have it

0^2c, 34x 03^2

its quite simple actually
Sep 13 2011 7:43PM
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p-fo
Posts: 9372 - Karma: 6,155
1. Plug it in. It is literally that simple.
2. Graph it and look at the graph's behavior as it approaches zero from the left side. Those who said infinity were correct.
3. You have to find a value for c that allows you to factor out x-1. You have to make it into a removable discontinuity.

Protip: graph everything.
Sep 13 2011 8:05PM
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Blindsurfer
Posts: 2252 - Karma: 2,785
94
Sep 13 2011 8:16PM
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es94
Posts: 291 - Karma: 67
thanks everybody. after i saw the answers i was able to work the problems out
Sep 13 2011 8:27PM
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arandomname
Posts: 1989 - Karma: 18

You have to find a value for c that allows you to make the top equal 0 because the bottom equals 0.  If the top were to be anything other than zero, the limit would not exist.

Sep 14 2011 4:26PM
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