consider the following function:
f(x)=sqrt(50-x)
find the linear approximation of f(x) at a=1
Don't you mean at (and near) x=1?
You never define what "a" is and it does not appear in f(x)
f(x)=sqrt(50-x)
find the linear approximation of f(x) at a=1
You never define what "a" is and it does not appear in f(x)