Question 949608
144/bē = 1 - (272.25/1089) = 816.75/1089. Divide each side by(816.75/1089). This leaves the right side as 1. Multiply each side by {{{b^2}}} to get {{{b ^2}}} alone. and leaves 144 /(816.75/1089) on the left side. Switching sides of an equality is fine. And I'm not certain exactly how the manipulation was done, but it seems to be mathematically sound.