EXERCISE 12 B

QUESTION 1

Add the following expressions

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

Sol: 2ab + 3b + 5ab + 7b

(ii) 2x^{2} + 3xy and 6xy – 4x^{2}

(iii) 5x^{2} – 11z + 7 and 10z^{2} -18 + 7z

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

(v) 4x^{2} – 7xy + 8z and x^{2} – 2xy + 9z and -3x^{2} + 8xy

QUESTION 2

Subtracted as indicated :

(i) (4a – 5b – c) – (3a + 2b – 7c)

(ii) 4x^{2} – 5x + 3 from 4x^{2} – 3x + 2

(iii) 4xy – 6 + y^2 from 5x^{2} + 6xy – 6

(iv) (-4x^{2} – x + 9) – (3x^{2} – x)

QUESTION 3

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

Sol :

QUESTION 4

Subtracted a^{2}-b^{2}-c^{2} from the sum of 2a^{2}+3b^{2}-c^{2} and 4a^{2}-3b^{2}+5c^{2}

Sol :

QUESTION 5

Subtracted the sum of (4a^{3}+2x^{2}-5) and (15x-x^{3}-x^{2}) from the sum of (9+6x-2x^{2}) and (4x-1-5x^{3}+x^{2})

Sol :