If A is a 2-rowed square matrix and │A│=6 then =?

44

If A= and ƒ(x)=2x² – 4x + 5 then ƒ(A)=?

45

If A= then A² – 4A = ?

47

If A is an invertible square matrix and k is a non-negative real number then (KA)^-1=?

48

If A=then A^-1=?