Question

Using Descartes’ rule of signs, which statement about this function is true?
f(x)= x4 – 2x3 + 4x2 – 2
It will have four or two positive real zeros and one negative real zero.
It will have one or three positive real zeros and one negative real zero.
It will have one positive real zero and one negative real zero.
It will have four or two positive real zeros and one or three negative real zeros.
It will have four or two positive real zeros and two or zero negative real zeros.