Consider the expression
r(x)=21x5−3x3+2x2−21x5+4.
Answer the following questions.
(i) Simplify r(x) by combining like terms.
(ii) For the simplified form of r(x), write down:
(a) its degree,
(b) the leading coefficient,
(c) the constant term.
(iii) State whether the simplified polynomial is a monomial, binomial, trinomial or has more than three terms.