Homework Help: Calculus

Posted by Jessie on Monday, January 28, 2013 at 10:54am.

In order to express the function
y=12^19x+7 as a composition of two functions the outer of which is an exponential function,we would let
u be equal to the inner function,
u=19x+7,
and then write y as a function of u, as follows: y= ???
.

(b) In order to express the function

P=sqrt10t^8+2,as a composition of two functions the outer of which is a root function, we would let u be equal to the inner function, u=10t^8+2, and then write P as a function of u, as follows:
P=???
.

(c) In order to express the function w=3ln(2r-4 )as a composition of two functions the outer of which is a logarithmic function, we would let
u be equal to the inner function,
u=2r-4,and then write w as a function of u, as follows: w= ???

Calculus - Steve, Monday, January 28, 2013 at 10:58am
a) man, they already did have the work. Substitute u=19x+7, and you have
y(u)=12^u

b) P(u)=√u

c) w(u) = ln(u)
Calculus - Jessie, Monday, January 28, 2013 at 10:59am
I actually figured out what u was equal to in each of the problems. I just wasn't sure how to answer the rest of the question. But thank you!
Calculus - Steve, Monday, January 28, 2013 at 11:02am
As far as I can tell, there is no rest of the question. Each parts asks how to write y,p,w as a function of u.

What is it that still bothers you? If

u(x) = 19x+7
v(x) = 12^x

y(x) = (u◦v)(x)
Calculus - Jessie, Monday, January 28, 2013 at 11:04am
Oh, no no. I was able to figure it out based on what you showed me.

You were just surprised that each problem already had the work, and I was simply saying that I was able to figure that part of the question out.

I just wasn't sure how to write the equations as a function of u.

Thank you for your help. I understand it now!
Calculus - Jessie, Monday, January 28, 2013 at 11:05am
Long story short - I did the hard work, and I didn't think the second part of the question would be that easy, haha.

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