Find the zeroes for the following functions

he zeros of the following functions. f (x) = -x4+ 3x3 - 2x2 f ( x ) = x2 +x-2 x2-4 f (x) = 5x - 2 f(x) = ex + 6e-x - 5 f (x) = sin(2x) - cos(x) f (x) = |tan x - 1. For 0