Prev

Next

Q43 of 98 Page 314

If A is an invertible matrix and A^-1 = then A=?

y property of inverse

(A^-1)^-1 = A

(A^-1)^-1 =^-1

A =^-1 ------------ 1

^-1 = 3 x 6 – 4 x 5

-2

C₁₁ = 6 C₁₂ = -5

C₂₁= -4 C₂₂ = 3

Cofactor matrix A =

Adj A =

^-1 =

=

Putting in 1

A =

More from this chapter

41

If A=, then A^-1=?

42

If │A│=3 and A^-1=then adj A=?

44

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

45

If A= then A² – 4A = ?