Sqrt(243)-sqrt(75)=sqrt(x)

Question

^{_{Find x in the question.}}

Answer 1

√243-√75=√x

√(81*3)-√(25*3)=√x

9√3-5√3=√x

4√3=√x

square both sides (or put 4 under the radical sign as 16)

16*3=x

x=48