Hey! How do you find the derivative of the following using the first derivative principles? a) f(x)=7/x-x b) f(x)=(x+1)^1/2
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Originally Posted by Sculthorp Hey! How do you find the derivative of the following using the first derivative principles? a) f(x)=7/x-x b) f(x)=(x+1)^1/2 use the formula, there are two, the usually used as far as i can see is $\displaystyle f'(x) = \lim_{h \to 0} \frac {f(x + h) - f(x)}h$ Hint: for the second problem, multiply by the conjugate of the numerator over itself to simplify can you finish?
Thanks for the help! The problem is with the 7/x-x I get 7/0 which is not possible right? So.... is this not possible to get the derivative?
I don't think the function is $\displaystyle \frac{7}{x-x}$ ... most probably it's $\displaystyle \frac{7}{x} - x$
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