Question

корень 252/4 корень 7

Answer 1

$sqrt{ frac{252}{4} } * sqrt{7}= sqrt{63}* sqrt{7} = sqrt{7*9*7}=7*3=21$

Answer 2

$sqrt{ frac{252}{4} } * sqrt{7} = sqrt{63} * sqrt{7}= sqrt{63*7} = sqrt{441} =21$