Question 2 :
Add the expression: $l^2 + m^2$ , $m^2 + n^2$ , $n^2 + l^2$ , $2lm + 2mn + 2nl$

Question 4 :
The base of a parallelogram is (2x + 3) units and the corresponding height is (2x – 3) units. What will be the area of a parallelogram of x = 30 units?

Question 7 :
Use a suitable identity to get the product: $(6x – 7) (6x + 7)$

Question 9 :
Use a suitable identity to get the following product : $\left(\frac{x}{2}+\frac{3y}{4}\right)\left(\frac{x}{2}+\frac{3y}{4}\right)$

Question 10 :
Which of the following is(are) binomial(s) with only x as a variable?

Question 11 :
Using $(x + a) (x + b) = x^2 + (a + b) x + ab$, find: $9.7 \times 9.8$

Question 14 :
Using the Identity (I) : $(a+b)^2 = a^2 + b^2 + 2ab$ ,find $(103)^2$

Question 17 :
The area of a square is given by $4x^2+ 12xy + 9y^2$. Find the side of the square.

Question 18 :
State true or false: 3xy and 5yx are like terms, which are like 7xy.

Question 19 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1ace78c526e972caf064.PNG' /> In the above figure, the length and breadth of the rectangle has been changed from $l$ and $b$ to $l+5$ and $b-3$ respectively. What is the expression for the area of the new rectangle ?