17 f(x) =x4-8x2+16 18. f(x) =-x4+4x3-4x2 lim lim X -> - 00 f(x) = lim x -> too f(x ) =_ lim X - - 00 f(x) = x - + 0 f ( x) = f'(x) = 4x(x-2)(x+2) f' (x) = -4x(x-2)(x-1) y' Relative maximum points. Relative maximum points. Relative minimum points. Relative minimum points Absolute maximum value. Absolute maximum value. Absolute minimum value. Absolute minimum value. f (x ) = xex f (x) =x2 ex lim lim lim lim 19. f ( x ) =_ 20. X -> - 00 x -> + 0 f ( x) = X - -00 f(x) =_ f( x) = x -> + 0 f'(x) = ex (x+1) f'(x) = xe* (x+2) y' Relative maximum points. Relative maximum points. Relative minimum points. Relative minimum points Absolute maximum value. Absolute maximum value. Absolute minimum value. Absolute minimum value