Question

guys answer it quickly plzzzz
Given that A =[ 5 7 3
1 5 2
3 2 1] and
A³-KA²+lA=I then
(a) k=1
(b) l=15
(c) k=-11
(d)l=10
multiple choice (Q)​

Answer 1

Step-by-step explanation:

Here,

If A = 1

Then,

A³ - kA² + IA = l

1³ - 1x1² + 10x 1 = 15

10 = 15

Answer 2

$\huge\rm\underline\purple{Answer:-}$

Consider the following identity A(adjA)=∣A∣I. Thus comparing it with the above equation gives us ∣A∣=10