Question 193742
*[Tex \LARGE P=2L+2W]


*[Tex \LARGE 30=2\sqrt{x+6}+2(6)] ... *[Tex \LARGE L=\sqrt{x+6}], *[Tex \LARGE W=6], 


*[Tex \LARGE 30=2\sqrt{x+6}+12]


*[Tex \LARGE 30-12=2\sqrt{x+6}]


*[Tex \LARGE 18=2\sqrt{x+6}]


*[Tex \LARGE \frac{18}{2}=\sqrt{x+6}]


*[Tex \LARGE 9=\sqrt{x+6}]


*[Tex \LARGE 9^2=x+6]


*[Tex \LARGE 81=x+6]


*[Tex \LARGE 81-6=x]


*[Tex \LARGE 75=x]


Ans: *[Tex \LARGE x=75]