Question

class 9 RD Sharma book chapter 4 exercise 4.4 question 2 solution​

Answer 1

Answer:

(i) (9y2 – 4x2)(81y4 + 36x2y2 + 16x4)

= (9y2 – 4x2) [(9y2 ) 2 + 9y2 x 4x2 + (4x2) 2 ]

= (9y2 ) 3 – (4x2)3

= 729 y6 – 64 x6

Put x = 3 and y = -1

= 729 – 46656

= – 45927

(ii) Put x = 3 and y = -1

(3/x – x/3)(x2 /9 + 9/x2 + 1)

RD sharma class 9 maths chapter 4 ex 4.4 question 2 solution part 2

(iii) Put x = 3 and y = -1

(x/7 + y/3)(x2/49 + y2/9 – xy/21)

RD sharma class 9 maths chapter 4 ex 4.4 question 2 solution part 3

(iv) Put x = 3 and y = -1

(x/4 – y/3)(x2/16 + xy/12 + y2/9)

RD sharma class 9 maths chapter 4 ex 4.4 question 2 solution part 4

(v) Put x = 3 and y = -1

(5/x + 5x)(25/x2 – 25 + 25x2).

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