Question

can you explain me how this guys got to that step specified in the picture http://screencast.com/t/lDQJKrEO3Esj thanks a lot

Answer 1

They use basic power rules to get to the next step

Answer 2

(a/b)^n = a^n / b^n

Answer 3

\(\dfrac{(k+1)^{50}}{k^{50}}=(\dfrac{k+1}{k})^{50}=(\dfrac{k}{k}+\dfrac{1}{k})^{50}=(1+\frac{1}{k})^{50}\)