Homework Help: math

Posted by APPRECIATIVE STUDENT on Monday, January 17, 2011 at 8:52pm.

Thank you for your help :)
"The piecewise function

f(x)= n(x^3)-x______when____x<(or=to)1
=m(x^2)+5_______when_____x>(or=to)1

is differentiable everywhere. What is n?

If you could explain step by step how to do this that would be great because I just do not see how to do this problem...thank you

math - bobpursley, Monday, January 17, 2011 at 8:58pm
is it continous, and is f' continous
f(1)=n-1
g(1)=m+5, or m+5=n-1 or m=n-6

f'=3nx^2
f'(1)=3n
g'=2mx
g'(1)=2m
so continous means 2m=3n or 2n-12=3n
n=-12

check my work.

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