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S.chand books class 8 maths solution chapter 13 Algebric Identities exercise 13 A

Exercise 13 A


Multiply mentally and write only the products for each of the following .

Question 1

(x+4)(x+2)

Sol :

 


Question 2

(a+1)(a+8)

Question 3

(c+3)(c+2)

Question 4

(b-2)(b-5)

Question 5

(n-1)(n-6)

Question 6

(3-x)(5-x)

Question 7

(y-7)(y+3)

Question 8

(m+3)(m-2)

Question 9

(x-4)(x+6)

Question 10

(p+10)(p-9)

Question 11

(xy+6)(xy-5)

Question 12

(5-xy)(3+xy)

Question 13

(x2+3)(x2+6)

Question 14

(4-x2)(10+x2)

Question 15

(ab-13)(ab-4)

 

Question 16

(2x+3)(3x+2)

 

Question 17

(4x+7)(5x+6)

Question 18

(7x+1)(x+3)

Question 19

(2a2+3b2)(2a2-5b2)

 

Question 20

(2x2-7y2)(3x2+8y2)

Question 21

(i) (x+17)(x+2)

(ii) (x+1)(3-x)

(iii) (x-p)(x-q)

(iv) (2+3x)(3-5x)

(v) (5-x)(x+8)

(vi) (px-1)(px-1)

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