Question

22. Simplify the expression 2(a

2

+ ab) – ab and find its value if, a = 5 and b = 2

23. Draw the Top, Side and Front view of the solid:



Top

Side

Front

24. Give the order of the rotational symmetry of the given figures about the point marked ‘X’

25. Simplify:-

125 X 53 X t5

_______________

503 X t3

SECTION-D

26. From the sum of 4 + 3x and 5 – 4x + 2x2

, subtract the sum of

3x

2

– 5x and –x

2

+ 2x + 5

27. From a circular card sheet of radius 14 cm, two circles of radius 3.5 cm and a rectangle of

length 3 cm and breadth 1cm are removed. (as shown in the adjoining figure). Find the area of the remaining sheet​

Answer 1

Answer:

22. if A=5 and B=2, then value of 2(a2+ab) -ab

= 2( 5*2+5*2) - 5*2

=2(10+10) -10

=2(20) -10

=40-10

=30