Factorisation

Factorisation

43. The representation of an expression as the product of its factors is called

  • (A) Commutativity
  • (B) Distributivity
  • (C) Factorisation
  • (D) Expansion

42. The irreducible factorisation of 3a3 + 6a is

  • (A) 3a(a2 + 2)
  • (B) 3(a3 + 2)
  • (C) a(3a2 + 6)
  • (D) 3 × a × a × a + 2 × 3 × a

41. Common factor of x2y and –xy2 is xy.

  • (A) xy
  • (B) x only
  • (C) y only
  • (D) None of these

40. Common factor of ax2 + bx is

  • (A) ax2
  • (B) x2
  • (C) x
  • (D) bx

39. What is the value of (3x + 3x2) ÷ 3x?

  • (A) 3x
  • (B) 3x2
  • (C) 3
  • (D) 3x3

38. Which of the following is the correct value of 6x3 ÷ 3x2?

  • (A) 2x2
  • (B) 2x
  • (C) 3x
  • (D) 2x5

37. The common factor of 3ab and 2cd is

  • (A) 1
  • (B) – 1
  • (C) a
  • (D) c

36. An irreducible factor of 24x2y2 is

  • (A) x2
  • (B) y2
  • (C) x
  • (D) 24x

35. Number of factors of (a + b)2 is

  • (A) 4
  • (B) 3
  • (C) 2
  • (D) 1

34. The factorised form of 3x – 24 is

  • (A) 3x × 24
  • (B) 3(x – 8)
  • (C) 24(x – 3)
  • (D) 3(x – 12)

33. The factorisation of 2x + 4y is

  • (A) 2(x + y)
  • (B) 2(x + 2y)
  • (C) x(2 + y)
  • (D) x(x + 2y)

32. Common factor of 17abc, 34ab2, 51a2b is

  • (A) 17abc
  • (B) 17ab
  • (C) 17ac
  • (D) 17a2b2c

31. Factorised form of r2 – 10r + 21 is

  • (A) (r – 1) (r – 4)
  • (B) (r – 7) (r – 3)
  • (C) (r – 7) (r + 3)
  • (D) (r + 7) (r + 3)

30. Factorised form of p2 – 17p – 38 is

  • (A) (p – 19) (p + 2)
  • (B) (p – 19) (p – 2)
  • (C) (p + 19) (p + 2)
  • (D) (p + 19) (p – 2)

29. On dividing 57p2qr by 114pq, we get

  • (A) ¼pr
  • (B) ¾pr
  • (C) ½pr
  • (D) 2pr

28. The factors of x2 – 4 are

  • (A) (x – 2), (x – 2)
  • (B) (x + 2), (x – 2)
  • (C) (x + 2), (x + 2)
  • (D) (x – 4), (x – 4)

27. Which of the following is not the correct value of –20x4 ÷ 10x2?

  • (A) –x2x2
  • (B) –2x2
  • (C) –2x × x
  • (D) –2x

26. Which of the following is the correct value of (2x)2?

  • (A) 2x2
  • (B) 4x2
  • (C) 4x
  • (D) x2

25. Factorisation of 5z2 – 80 is

  • (A) 5(z2 – 16)
  • (B) 5(z – 16)
  • (C) 5(z – 4)(z + 4)
  • (D) (z – 4)(z + 4)

24. The value of (–27x2y) ÷ (–9xy) is

  • (A) 3xy
  • (B) –3xy
  • (C) –3x
  • (D) 3x

23. The value of (2x2 + 4) ÷ 2 is

  • (A) 2x2 + 2
  • (B) x2 + 2
  • (C) x2 + 4
  • (D) 2x2 + 4

22. Which of the following is the correct value of 3(x – 4)?

  • (A) 3x – 4
  • (B) 3x – 12
  • (C) x – 4
  • (D) x – 12

21. Which of the following is the correct value of (x + 8)2?

  • (A) x2 + 64
  • (B) x2 + x + 64
  • (C) x2 + 16x
  • (D) x2 + 16x + 64

20. Which of the following is the correct value of (x – 5)2?

  • (A) x2 – 25
  • (B) x2x + 25
  • (C) x2 – 10x + 25
  • (D) x2 – 10x + 5

19. Which of the following is the correct value of 2x + 3y?

  • (A) 6xy
  • (B) 5x + y
  • (C) 2x + 3y
  • (D) 5xy

18. Factorised form of 18mn + 10mnp is

  • (A) 18m(n + np)
  • (B) 2mn(9 + 5p)
  • (C) 2mn(9 + 10p)  
  • (D) 10mn(1 + p)

17. Factorised form of 4y2 – 12y + 9 is

  • (A) (2y – 3)(2y + 3)
  • (B) (2y – 3)(2y – 3)
  • (C) (y – 3)(2y – 3)  
  • (D) (y – 3)(y – 3)

16. 38x3y2z ÷ 19xy2 is equal to

  • (A) 2x2z
  • (B) 2xyz
  • (C) 2x2y
  • (D) 2xy

15. Simplified value of (9x – 81) ÷ 9 is

  • (A) x – 9
  • (B) x – 81
  • (C) x + 81
  • (D) x + 9

14. Factorisation of –3a2 + 3ab + 3ac is

  • (A) 3a (–abc)
  • (B) 3a (–a + bc)
  • (C) 3a (–ab + c)
  • (D) 3a (–a + b + c)

13. Irreducible factor form of the expression 10x(x + 2) (y + 3) is

  • (A) 10x(x + 2) × (y + 3)
  • (B) 2 × 5 × (x2 + 2x) × (y + 3)
  • (C) 10 × x × (x + 2) × (y + 3)
  • (D) 2 × 5 × (x + 2) × (xy + 3x)

12. On dividing p(4p2 – 16) by 4p(p – 2), we get

  • (A) 2p + 4
  • (B) 2p – 4
  • (C) p + 2
  • (D) p – 2

11. The value of (a + 1) (a – 1) (a2 + 1) is

  • (A) a3 – 1
  • (B) a4 – 1
  • (C) a4 + 1
  • (D) a3 + 1

10. Factorised form of 23xy – 46x + 54y – 108 is

  • (A) (23x + 54) (y – 2)
  • (B) (23x + 54y) (y – 2)
  • (C) (23xy + 54y) (–46x – 108)
  • (D) (23x + 54) (y + 2)

9. Factorisation of 12a2b + 15ab2 is

  • (A) ab (4a + 5b)
  • (B) 3ab (4a + 5b)
  • (C) 3ab (4a + b)
  • (D) ab (4a + 5b)

8. In the factorisation of m4 – 256, how many factors will be there?

  • (A) 1
  • (B) 2
  • (C) 3
  • (D) 4

7. Which of the following is the correct value of (5x2 + 20x) ÷ (x + 4)?

  • (A) 5
  • (B) 5x
  • (C) 4x
  • (D) 4x(x + 4)

6. The value of (3x3 +9x2 + 27x) ÷ 3x is

  • (A) x2 + 9 + 27x
  • (B) 3x3 + 3x2 + 27x
  • (C) 3x3 + 9x2 + 9
  • (D) x2 + 3x + 9

5. Simplified value of (x3 + 2x2 + 3x) ÷ 2x is

  • (A) x2 + x2 + 3
  • (B) (x2 + 2x + 3)/2
  • (C) (x3 + 2x2 + 3)/2
  • (D) (x3 + 2 + 3x)/2

4. Simplified value of (3y8 – 4y6 + 5y4) ÷ y4 is

  • (A) 3y4 – 4y2 + 5
  • (B) 3y8 – 4y6 + 5
  • (C) 3y8 – 4y2 + 5y4
  • (D) 3y8 – 4y6 + 4y4

3. Simplified value of (p3q6p6q3) ÷ p3q3 is

  • (A) p3q3
  • (B) q6p3
  • (C) q3p3
  • (D) q3p6q3

2. Substituting x = – 3 in x2 + 5x + 4 gives

  • (A) (–3)2 + 5(–3) + 4 = 9 + 2 + 4 = 15
  • (B) (–3)2 + 5(–3) + 4 = –6 + 2 + 4 = 0
  • (C) (–3)2 + 5(–3) + 4 = 9 – 15 + 4 = –2
  • (D) (–3)2 + 5(–3) + 4 = –6 – 15 + 4 = –17

1. Substituting x = – 3 in x2 – 5x + 4 gives

  • (A) (–3)2 – 5(–3) + 4 = 9 – 8 + 4 = 5
  • (B) (–3)2 – 5(–3) + 4 = –6 – 8 + 4 = 10
  • (C) (–3)2 – 5(–3) + 4 = 9 + 15 + 4 = 28
  • (D) (–3)2 – 5(–3) + 4 = –6 + 15 + 4 = 13
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