Help Needed From A Mathematician

M

montyracing2

At the Start
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Apr 17, 2005
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Daughter's returned from her Grandma's needing homework help. With any luck if I can come up with the solution she might stay so:

how do I differentiate y = 2^x + 2^-x (^ means to the).


Any ideas

Thanks MR2
 
Thanks Bull,
the complication is that Sarah (and I, boasting) can differentiate each term easily but its the plus sign between the two terms that is throwinng us.

MR2
 
Not sure I understand why you're having the difficulty.

The derivative of the sum of two diferentiable functions is the sum of their derivatives.

So differentiate the first term, and the second term. And add them together.

Are you having problems adding the two terms together?
 
Am I the only person who finds that this thread makes me feel that I am not as intelligent as I thought. Not a clue!
 
We are differently intelligent, Tout. While Bar was locked away doing calculus we were out ridin' and drinkin'. Not with each other obviously as I am much younger than you.
 
Thanks Bar, when she gets home from the weekly Saturday party sleep-over, this didn't happen when I was seventeen, we'll have another go.

There's a mute point, because I, and most of my friends, were more restricted in our galavantings on the run upto our A-levels - I wonder if Sarah will be able to differentiate and find nth terms 35 years on. I think not, the young people of today seem to do just enough to pass their next exam and can't see education as a lifelong vocation.

Sorry, An C and others, if you are feeling increasingly insecure over these mathematical challengers. I'm sure when Sarah, being my youngest, leaves for uni and I am no longer called upon to remember such things as dy by dx, equations of tangents, transformations, graph funtions etc, my mathematical inclination will also diminish.

Love the one line come backs - MR2
 
I once thought and hoped that too, Bar.

I was just thinking about it while I was waiting to bail him out last night.
 
Bar, I have been very lucky as a parent, that is until Sarah hit seventeen and the boys left for Uni (Sarah has taken up the alpha position in the family hierarchy and can she bite).

Anyway, one single piece of advice for the little one in the push-chair, read to the child every day of its life for half an hour until it can read, and then when it can talk, pose questions on what you have just read. Don't hang around with 'Jack and Jill', start a good read asap.

Its not the story/readiing that matters, its the child seeing someone read that's important soon to be followed by a simple discussion.


MR2
 
Monty, I agree completely, my parents have about 4000 books in the house and always encouraged us to read lots. I have hundreds of books in my house and love reading, I do believe that kids who get read to develop better
 
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