Question

EXERCISE 6E
OBJECTIVE QUESTIONS
Tick (V) the correct answer in each of the following:
1. The sum of (6a + 4b-c + 3), (2b-3c + 4), (1 lb-7a+2c-1) and (2c-50-6) is
(a) (4a-6b+2)
(d) (-6a + 6b+ C-4)
(b) (-3a +14b - 3c+2) (c) (-6a +17b)​

Answer 1

Answer:

The sum of (6a + 4b – c + 3), (2b – 3c + 4), (11b – 7a + 2c – 1) and (2c – 5a – 6) is

Ans: (c) (- 6a + 17b)

Solution: (6a + 4b – c + 3) + (2b – 3c + 4) + (11b – 7a + 2c – 1) + (2c – 5a – 6)

= 6a + 4b – c + 3 + 2b – 3c + 4 + 11b – 7a + 2c – 1 + 2c – 5a – 6

= – 6a+17b

3q + 7p2 – 2r3 + 4) – (4p2 – 2q + 7r3 – 3) =?

Ans: (d) (3p2 + 5q – 9r3 + 7)

Solution: 3q + 7p2 – 2r3 + 4 – 4p2 + 2q – 7r3 + 3

= 3p2 + 5q – 9r3 + 7