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If a, b, c and d satisfy the equations
a + 7b + 3c + 5d = 0,
8a + 4b + 6c + 2d = –4
2a + 6b + 4c + 8d = 4,
5a + 3b + 7c + d = –4,then (a + d) = ? (b + c)
-
- 0
- 1
- –1
- –4
- 0
Correct Option: C
8a + 4b + 6c + 2d = –4
2a + 6b + 4c + 8d = 4
On adding,
10a + 10b + 10c + 10d = 0
⇒ a + b + c + d = 0
⇒ a + d = –(b + c)
| ⇒ | = -1 | |
| b + c |
