(13) Verify a + (b + c) = (a + b) + c and
3 (-5)
write the sum for a = b=
and
16
24
(-11)
32
Answers
Answer:
Time Allowed: - 45 mins
Maxmum Marks: 25
I. Answer the following question:
5 x 2 = 10
1. The area of a rectangle is x4 + 9x2 + 20 sq.units and its length is x2 + 4 units.
Find its breadth in term of x.
2. Find GCD of 25x?y?z, 45x²y+zb.
3. Factorise 2x2 – x2 – 12x – 9 into linear factors.
4. Solve by the method of elimination 2x + y ---4 and 5x – 3y = 1.
5. Find the value of k of the given system of linear equations satisfying the condition
below: kx + 3y = 3; 12x + ky = 6
II. Answer the following question.
3 x 5 = 15
6. If 8x2 – 14x2 – 19x – 8 is divided by 4x + 3 then find the quotient and the
remainder
7. The age of Arjun is twice the sum of the ages of his two children. After 20 years,
his age will be equal to the sum of the ages of his children. Find the age of the