Consider each of the following algebraic expressions:
4x2−3x+7,5x−1+2,x+1,43x3−21x,7,x2+0x+9
Answer the questions given below.
(i) For every expression, state whether it is a polynomial in x. Give a brief reason for your answer in each case.
(ii) For each expression that is a polynomial, state its degree.
(iii) Among the polynomial expressions identified in part (i), classify each as a monomial, binomial or trinomial after removing any zero terms.