The value of
-7(a+b+c) - {-5(a+b+c)} is

If a, b, c, d satisfy the equation a + 7b + 3c + 5d = 0 , 8a + 4b + 6c + 2d = - 16 , 2a + 6b + 4c + 8d =16 and 5a + 3b + 7c + d = -16 then the value of (a + d) (b + c) =______

If a=7,\ b=5,\ c=3, then the value of a^2+b^2+c^2-a b-b c-c a\ i s -12 (b) 0 (c) 8 (d) 12

If 2160 = 2^(a). 3^(b) . 5^(c ) , find a, b and c. Hence calculate the value of 3^(a) xx 2^(-b) xx 5^(-c ) .

Let a, b and c be real numbers such that a - 7b + 8c = 4 and 8a + 4b - c = 7. What is the value of a^(2) - b^(2) + c^(2) .

The value of (a-b)(a+b)+(b-c)(b+c)+(c+a)(c-a) is :

The value of |{:(1+a,b,c),(a,1+b,c),(a,b,1+c):}| is

The value of the determinant |-a b c a-b c a b-c| is equal to- 0 b. (a-b)(b-c)(c-a) c. (a+b)(b+c)(c+a) d. 4a b c

In Delta ABC a =5 ,b=3 ,c=7 .Then value of 3 cos C +7 cos B is equal :-

If |a|=1,|b|=3 and |c|=5 , then the value of [a-b" "b-c" "c-a] is

The value of |(a-b,b+c,a),(b-a,c+a,b),(c-a,a+b,c)| is