`ab - a - b +1 =?`

(ab) +2 (a + b) +1

True or False statements : If A and B are invertible matrices then AB is invertible and (AB)^-1 = B^-1 A^-1

If A = [[2,3],[1,2]] , B = [[1,0],[3,1]] . Find AB and (AB)^-1 . Verify that (AB)^-1 = B^-1.A^-1 .

If log_(2)7= a and log_(3)2=b ," then the value of log_(14)84 is : (A) (1+3b+2ab)/(ab-b) (B) (1+2b+ab)/(b+ab) (C) (1+a+b)/(a+b) (D) (1+b+ab)/(a+ab)

If A and B be two non singular matrices and A^(-1) and B^(-1) are their respective inverse, then prove that (AB)^(-1)=B^(-1)A^(-1)

If A = [[2,3],[1,-4]], B = [[1,-2],[-1,3]] ,then verify that (AB)^-1 = B^-1A^-1

If A= {:[( 2,3),( 1,-4) ]:}and B = {:[( 1,-2),( -1,3) ]:} ,then verify that (AB)^(-1) =B^(-1) A^(-1)