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NCERT SOLUTIONS CLASS 9 MATHEMATICS

Exercise 2.1

Q.1. Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.

(i) 4x2 - 3x + 7

(ii) y2 + 2

(iii) 3t + t2

(iv) y + 2y

(v) x10 + y3 + t50

Q.2: Write the coefficients of x2 in each of the following:

  1. 2 + x2 + x

  2. 2 - x2 + x3

  3. π2 x2 + x

  4. 2x - 1

Q.3. Give one example each of a binomial of degree 35, and of a monomial of degree 100.

Q.4: Write the degree of each of the following polynomials:

  1. 5x3 + 4x2 + 7x

  2. 4 - y2

  3. 5t - 7

  4. 3

Q.5: Classify the following as linear, quadratic and cubic polynomial:

  1. x2 + x
  1. x - x3
  1. y + y2 +4
  1. 1 + x
  1. t
  1. r2
  1. 7x3