Use the definition of a Taylor series to find the first four nonzero terms of the series for fx) centered at the given value of a. (Enter your answers as a comma-separated list.) f(x) a 2 1x 7 -7 3 9...

I don't quite understand What I am doing wrong in this taylor series

Extracted text: Use the definition of a Taylor series to find the first four nonzero terms of the series for fx) centered at the given value of a. (Enter your answers as a comma-separated list.) f(x) a 2 1x 7 -7 3 9 2)2) 2)3