If `[ [ a + b , 2 ] , [ 5 , b ] ] = ([ [ 6 , 5 ] , [ 2 , 2 ]])^(')` ; then find the value of a

If a= 3, b = 2 and c = 5 then find the value of a^2-3b^2+ac

if U = {1, 2, 3, 4, 5, 6, 7, 8, 9}, B = { 2, 4, 6, 8} and C = {3, 4, 5, 6} then find the value of (B - C)'.

If U = {1, 2, 3, 4, 5, 6, 7, 8, 9}, B = { 2, 4, 6, 8} and C = {3, 4, 5, 6} then find the value of B nn C' .

If U = {1, 2, 3, 4, 5, 6, 7, 8, 9}, B = { 2, 4, 6, 8} and C = {3, 4, 5, 6} then find the value of (B -C)' .

If A=[[1,2,5],[3,4,6]] and B=[[4,0],[2,1]] then find the value of AB.

If a+b=5 and a-b=1 then find the value of 8ab(a^2+b^2)

If A : B = 1 : 2, B : C = 3 : 4 and C : D = 5 : 6, then find the value of D : C : B.

If a/b = ( 4/3 )^-2 ÷ ( 5/6 )^0 , find the value of ( a/b )^-2

If a=5+2sqrt(6) and b=(1)/(a), then find the value of a^(2)+b^(2)