Need help on homework

$\sqrt{ {(\frac{249}{49})}^{2}}= \frac{249}{49}$

The sqrt( of a number scared is just that number, for example, sqrt(10)²=10

or sqrt(10-1)²=10-1=9, sooooooooo..., sqrt(249÷49)²=249/49=5 4/49≈5.0816326530612245