a 388 CHAPTER 4 EXPON the change-of-base} nula The change-of-base for la can be used ers M, b, and n 7) Continued base formu log ( b) (5 points) Find zeros of polynomial functions P(x) = 6x5/3 +19x2/3 - 85x-1/3 = 6X513 + 19x73- 85 x1/3 My = 10 x , 15 = 3, Mg = - 85 = a #3 (672 93 + 19 /3 - 852f Real Fences . M = 3 = 2 3 1 6 72 2 + 19x - 85) (232+17 = 0 ( 30 272 - 5=0 32 +17 372:=517 2:22=5 2 2C n = - 17 - 5 - 15 3 n = 5 2 - n (32+ 17 ) ( 2 21 - 5) 8) (6 points) Find inverse function of f (x) = 2x+3 x - 1 2 = 27+3 y - I a (yfz ) = 2 ry + 3 - n - 3 = 2 4 - my - M2 - 3 = y ( 2 - 2 ) -2 - 3 = y 2 - 21 Jim ) = - 2 - 3 2 - 20