NCERT Mathematics Class 9 Exemplar Ch 2 Polynomials Part 7 (For CBSE, ICSE, IAS, NET, NRA 2022)
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Q. 24. Factorise:
(i)
(ii)
(iii) (iv)
Answer: (i)
(ii)
(iii)
(iv)
Q. 25. Using suitable identity, evaluate the following:
(i)
(ii)
(iii) 9992
Answer: (i) , (ii) , (iii)
Q. 26. Factorise the following:
(i)
(ii)
(iii)
Answer: (i) , (ii) , (iii)
Q. 27. Factorise the following:
(i)
(ii)
Answer: (i) , (ii)
Q. 28. Expand the following:
(i)
(ii)
(iii)
Answer: (i) (ii) (iii)
Q. 29. Factorise the following:
(i)
(ii)
(iii)
Answer: (i) ,
(ii)
(iii)
Q. 30. If and , find .
Answer: 29
Q. 31. Expand the following: (i) (ii) (iii)
Answer: (i) (ii)
(iii)
Q. 32. Factorise the following:
(i)
(ii)
Answer: (i)
(ii)
Q. 33. Find the following products:
(i)
(ii)
Answer: (i)
(ii)
Q. 34. Factorise: (i)
(ii)
Answer: (i)
(ii)
Q. 35. Find the following product:
Answer:
Q. 36. Factorise: (i)
(ii) .
Answer: .
(i)
(ii)
Q. 37. Without actually calculating the cubes, fined the value of:
(i)
(ii)
Answer: (i)
(ii)
Q. 38. Without finding the cubes, factorise
Answer:
Q. 39. Find the value of (i) , when
(ii) , when
Answer: (i) 0 (ii) 0
Q. 40. Give possible expressions for the length and breadth of the rectangle whose area is given by
Answer: One possible answer is: Length , Breadth