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September 18, 2014

September 18, 2014

Posted by **Aparna** on Tuesday, March 19, 2013 at 3:05pm.

A) find f'(x)

B) write an equation for the tangent to the graph of f at x=3

C) let g be the function defined by g(x)= (f(x) for -5<or=x<or=-3)and (x+7 for -3<or=x<or=5)

D) find the value of the intagral 5 over 0 of x(25-x^2)^(1/2)dx

- Calc -
**Steve**, Tuesday, March 19, 2013 at 3:07pmdo you have no idea at all about any of these questions? Hard to believe this would come up till the topics have been covered. They look like pretty straightforward calculus and algebra operations.

How far do you get?

- Calc -
**Aparna**, Tuesday, March 19, 2013 at 3:12pmi found A and B, just checking if they're right. C i can never remember how to do these. D i haven't tried yet but i could probably figure out but i figured since i was putting the rest up i would do it as well

- Calc -
**Steve**, Tuesday, March 19, 2013 at 3:19pmThere's nothing to figure out for C. They're just defining a new function. Not sure why it's even there.

For D, it's pretty straightforward. Let

u = 25-x^2

then du = -2x dx and we have

∫[0,5] x√(25-x^2) dx

= ∫[5,0] -1/2 √u du

and it's clear sailing from there on

- Calc -
**Aparna**, Tuesday, March 19, 2013 at 3:21pmthank youu

- Calc -
**Steve**, Tuesday, March 19, 2013 at 3:22pmA: d/dx √(25-x^2) = -x/√(25-x^2)

B. At x=3, f(x)=4, so

f'(3) = -3/4

Now you have a point (3,4) and a slope: -3/4

y-4 = -3/4 (x-3)

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