Verify that
(i) 3 is a zero of the polynomial x-5.
(ii) -2 is a zero of the polynomial x+2.
`(iii) (7)/(3)` is a zero of the polynomial 3x-7.
(iv) 2 and 3 are zeros of the polynomial (x-2)(x-3).
`(v) (13)/(2)` and -3 are zeros of the polynomial `2x^(2)-7x-39`.