# DL#103 - 6 Jars of sigmoid neuron (||) - introducing Taylor series

While substituting values in taylor series, while substituting values for 3x^2, I didn’t get why x was substituted with 3,
because we are calculating ( 27 + .0001 )^3, so x value should be 3 right ?
Not sure if am missing out on something here.
Could someone please clarify ?

Right.
f(x)=x^3 and using Taylor Series it calculates value at f(x+\Delta{x}), where. x=3, and~ \Delta{x}=0.0001
So there is a mistake in the video, the values is getting calculated at (3+0.0001)^3 not (27+0.0001)^3