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August 3, 2015

Homework Help: calculus

Posted by ken on Saturday, March 2, 2013 at 10:53pm.

sorry for the probably simple question, but i haven't done this stuff in a long, long time.
thought i had this right, but again not finding the answer
which of the following gives the slope of the tangent line to the graph of y=2^(1-x) at x=2?
a)-1/2
b)1/2
c)-2
d)2
e)-(ln2)/2

so... it thought y=2^1-x)
then y'=(1-x)(2^(1-x-1))
at x=2
then y'=(1-2)(2^(1-2-1))
y'= -1(2^(-2))
y'= -1/4
any help figuring out where i went wrong would be greatly appreciated.

thank you

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