a) 16x5 = x
d) 5x3 = 320
g) 5x3 - 19 x2 = x2
b) 2x4 = 16x
e) x3 = 16x
h) x3(5x - 2) = 20x2 - 2x3
c) 2x3 - 7x = x
f) x2(x2 + 1) = x2 - 125x
i) x3 + x2 = 2x2
a) f(x) = x3 - 5x2 + 16x - 80
c) f(x) = x4 + x3 - 11x2 - 9x + 18
b) f(x) = x3 - x2 - 9x + 9
d) f(x) = x4 - x3 - 19x2 - 11 x + 30