[EXERCISE 2.1 .1 

        I. Which of the following expressionsare polynomials in one variable and which are 
            not? Give reasons for your answer.
            (I) 3x2 + 4x + 15 (ii) 5x3 - 4.x-2 + 6x - 3                                                                       (iii) 5 + 8x3/2 + 4x2 Yeiv) 4.1; +

                            2                                                                                                                                                       1
            (v) Y                                                         (vi) -sfic+ 6                             (vii) X2 ++ 4 (viii)      x2                                    -x    .
            (ix)x2 xy + 3                                      (x) xl5 +31° + z9
    2. Write the degree of each of the following polynomials:
            (I) 5x 4- 3                                        (ii) 3x2 + x + 5                                     (iii) 5x 3+ 7x2 + 3x + 2
            (iv) 7x2 + 6x4 + 5x + 8x3 + 8                                                                           (v) 0                                             (vi) 6
            (vii) 4 - 3x2 + 5x3 + 7'8 -x25                                                                          (viii) 1 - "Ix+ x2 (ix) -1§X3 + 2
    3. Write the coefficient of X2 in each of the following:
            (i) X2 -4- 4x + 3                                  (ii) 5 + 3x + 2x2                                    (iii)x3 - 3x2+ 2x + 3
            (iv) - 5x2 + x4 + 2x5(v) (x - 7)2                                                                       (vi) (2x - 1)2                                    (vii) (x - 3)3
    4. Classify the following as linear, quadratic and cubic polynomials:
            (i) x + 2                                          (ii) x2(iii)4y(iv) 3x2 + 3x
            (v) x3 + 2x2 + 4                                   (vi)(x + 3)3 - x3                                    (vii) (2 - x)2 - X2