True and false if false then give reason

(i)  y 3 + 5 y 2 + y + 6  is a polynomial.
(ii) (x − 3) is a factor of x 2 + 2x − 15.
(iii) (a − b) (a + b) is a binomial.
(iv) (x − 5)2 = x 2 − 10x − 25.
(v) To find the value of 252, we use the identity, a 2 − b 2 (a + b) (a − b).

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