Question

Q1.Multiple choice questions

1. In which of the following, the two expressions are like terms?

A. 7x and 7y

B. 7x and 9x

C. 7x and 7x2

D. 7x and 7xy

2. If we add, 7xy + 5yz – 3zx, 4yz + 9zx – 4y and –3xz + 5x – 2xy, then the answer is:

A. 5xy + 9yz +3zx + 5x – 4y

B. 5xy – 9yz +3zx – 5x – 4y

C. 5xy + 10yz +3zx + 15x – 4y

D. 5xy + 10yz +3zx + 5x – 6y

3. If we subtract 4a – 7ab + 3b + 12 from 12a – 9ab + 5b – 3, then the answer is:

A. 8a+2ab+2b+15

B. 8a+2ab+2b-15

C. 8a-2ab+2b-15

D. 8a-2ab-2b-15​

Answer 1

Answer:

2. 7xy-2xy+5yz+4yz-3zx+4yz-4y

=5xy+9yz-3zx+4yz-4z

3. (12a-9ab+5b-3)- (4a-7ab+3ab+12)

=12a - 9ab + 5b - 3 - 4a - 7ab +3ab +12

12a - 4a - 9ab -7ab +3ab +5b-3+12

8a - 13ab+5b-3+12