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2. Polynomials – Class 9 Maths NCERT Important Questions & Answers (CBSE Guide)

Chapter 2: Polynomials – Class 9 Maths NCERT Chapterwise Important Questions & Answers (CBSE)

Chapter 2: Polynomials

Choose the correct answers:

Q1. If   for all , then the value of is :

(A) 1        (B)  – 1     (C)  5     (D) 8

Ans:  (D)  8 

[ Hints:

 

  ]

Q2. Which one of the following is a polynomial ?

(A) 2-2      (B)  2x-1      (C) x²+3x32x       (D)  x-1x+1

Ans: (C) x²+3x32x      

 [ Hints:   x2+3x32x

=x2+3x32x-12 

=x2+3x32-12 

=x2+3x3-12 

=x²+3x22=x²+3x       ]

Q3. 2 is a polynomial of degree :

(A) 2            (B)  0      (C)  1            (D)  12

Ans:   (B)  0

Q4. Degree of the polynomial 4x4+0x³+0x5+5x+7 is :

(A) 4         (B)  5           (C)  3             (D) 7

Ans :  (A) 4

Q5. Degree of the zero polynomial is :

(A) 0     (B) 1          (C) Any natural number   (D) Not defined  

Ans: (A) 0 

Q6. If x=x2-22x+1 , then p(22) is equal to :

(A) 0         (B) 1      (C)  42      (D)  82+1

Ans:   (B)  1

[Hints: p22=222-22×22+1

=8-8+1=1    ]

Q7. The value of the polynomial 5x-4x2+3 , when x=-1 is :

(A)  – 6     (B) 6      (C)  2      (D) – 2 

Ans:   (A)  – 6    

[ Hints: Let px=5x-4x2+3  ;x=-1

 ∴  p1= 5×-1-4×-12+3

=-5-4+3=-6