-5(a+b)+2(2a-b)+4a-7

Evaluate : (ii) (2a - 5b) ( 2a + 5b) ( 4a^2 + 25b^2)

If a = 2 and b = 5, the value of the expression 2a-[3a+{4b-(2a-b)+5a}-7b] is :

Expand (2a -4b +7) (2a+ 4b+7)

If (a+3b)*(7a-5b)=0 and (a-4b)*(7a-2b)=0 . Then, the angle between a and b is

If (a+3b)*(7a-5b)=0 and (a-4b)*(7a-2b)=0 . Then, the angle between a and b is

Factorise : 5a^(2) - b^(2) - 4ab + 7a - 7b

If a:b=5:7 , then (5a-3b):(4a-2b) is equal to :

Factorise : 4a^(2) - 49b^(2) + 2a - 7b

Let A=[{:(-3,-7,-5),(2,4,3),(1,2,2):}] and B=[{:(a),(b),(1):}] If AB is a scalar multiple of B, then (a) 4a+7b+5=0 (b) a+b+2=0 (c) b-a=4 (d) a+3b=0

Which of the following has value not equal to zero ? a) |(8,2,7),(12,3,5),(16,4,3)| b) |(1//a,a^(2),bc),(1//b,b^(2),ac),(1//c,c^(2),ab)| c) |(a+b,2a+b,3a+b),(2a+b,3a+b,4a+b),(4a+b,5a+b,6a+b)| d) |(2,43,6),(7,35,4),(3,17,2)|