The length of a rectangle is 3 times the width if the area is 147 what is the perminer

Formula for are of a rectangle:

A = L * W

1st isolate W

147 = 3W * W

147 = 3W^2

divide 147 by the by 3 on bot sides

29 = W^2

get ride of the square by square rooting on both sides

7 = W

2nd find the perimeter

P = 2 (7) + 2 (21)

P = 14 + 42

P = 56