Q
Number twelve pleat

D e a r S t u d e n t, S o l u t i o n) f (x) = 2 x + 3 w h e r e x = \frac{1 + x}{1 - x} N o w, f (x) = 2 (\frac{1 + x}{1 - x}) + 3 f (x) = \frac{2 + 2 x}{1 - x} + 3 f (x) = \frac{2 + 2 x + 3 - 3 x}{1 - x} f (x) = \frac{- x + 5}{1 - x} f (x) = \frac{x - 5}{x - 1} R e g a r d s!