how solve this in vedic mathes?NO:47²

Dear Student,
Currently we do not provide solutions related to Vedic Maths.
We will solve the given problem using the method that is available in your text book.
Here is the answer for your question 
$$\begin{gathered} {\left(47\right)}^2 \\ ={\left(50 - 3\right)}^2 \\ ={\left(50\right)}^2 + {\left(3\right)}^2 - 2\left(50\right)\left(3\right) \left[\mathrm{as}, {\left(\mathrm{a}-\mathrm{b}\right)}^2 = {\mathrm{a}}^2+{\mathrm{b}}^2-2\mathrm{ab}\right] \\ =2500 + 9 - 300 \\ =2509 - 300 \\ =2209 \end{gathered}$$