Question

(ii) Let A be a 3 x 3 determinant and I Al = 7. Find the
value of I2A I.

(Assam B. 2017)​

Answer 1

Answer:

14

Step-by-step explanation:

given |A| = 7 ....(1)

and |2A| can be written as 2|A|.....(2)

∴ from (1) and (2) 2×7=14