# Thread: question regarding taylor series

1. ## question regarding taylor series

I got solution of a question. Can any body explain the highlighted lines to me

2. Originally Posted by moonnightingale
I got solution of a question. Can any body explain the highlighted lines to me

d was just factored out: $\sqrt{a^2+b^2}=\sqrt{a^2\left(1+\frac{b^2}{a^2}\ri ght)} = a\sqrt{1+\frac{b^2}{a^2}}$

Tonio