Question 191555
sqrt  (75a)  /  sqrt  (49)   

sqrt  (  3 *25 *a)  /  7

since  sqrt  25  =  5,

5*  sqrt (3*a)  /7

or    (5 / 7 )  sqrt  (3 *a)



note  it  is  often  teachers  preference  that  sqrt  = ( + or  -  )  the  number