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:

1st...b. 2nd...a. 3rd....c

Answer 2

Answer:

1. B
2. A
3. C

Explanation:

1.Equation having same variable are called like terms so the answer is b 7x and 9x

2.(7xy+5yz-3xz)+(4yz+9xz-4y)(-3xz+5x-2xy)

7xy+5yz-3xz+4yz+9xz-4y-3xz+5x-2xy

7xy-2xy+5yz+4yz-3xz-3xz+9xz+5x-4y

Ans- 5xy+9yz+3xz+5x-4y

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

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

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

Ans- 8a-2ab+2b+15

How to solve ;

1. Write the problem inside braces
2. Remove the braces and write the equation(if in subtraction do according to integers)
3. Write same variable together and different one after them
4. Solve as per equation and integers

Hope it helps you....