Question

If A =[ 3 / −4 -5/2] , find A2 − 5A − 14I, where I is the unit matrix of order 2 × 2.​

Answer 1

this is the answer

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Answer 2

Answer:

2A = [ 6/ -8. -10 /4]

5A = [ 30/ -40. -50 / 20]

14I = [ 14/ 0 0/14]

Therefore,

2A - 5A - 14I = [ - 23 / 12. 15 /-20]