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S.chand books class 8 maths solution chapter 12 Fundamental concept and Operations exercise 12 B

EXERCISE 12 B


QUESTION 1

Add the following expressions

(i) 2ab + 3b and 5ab + 7b

Sol:  2ab + 3b + 5ab + 7b

 

(ii) 2x2 + 3xy and 6xy – 4x2

(iii) 5x2 – 11z + 7 and 10z2 -18 + 7z

(iv) y2 – 3y2 + 7y – 17 and 2y^2 – 5y – 8y2 + 20

(v) 4x2 – 7xy + 8z and x2 – 2xy + 9z and -3x2 + 8xy


QUESTION 2

Subtracted as indicated :

(i) (4a – 5b – c) – (3a + 2b – 7c)

(ii) 4x2 – 5x + 3 from 4x2 – 3x + 2

(iii) 4xy – 6 + y^2 from 5x2 + 6xy – 6

(iv) (-4x2 – x + 9) – (3x2 – x)

 


QUESTION 3

From the sum of x + 3y and -3x – y subtracted x – y

Sol :

 


QUESTION 4

Subtracted a2-b2-c2 from the sum of 2a2+3b2-c2 and 4a2-3b2+5c2

Sol :

 


QUESTION 5

Subtracted the sum of (4a3+2x2-5) and (15x-x3-x2) from the sum of (9+6x-2x2) and (4x-1-5x3+x2)

Sol :

 

 


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