Fundamentholfundamenthol
JEE Main2026Apr 5, Shift 1Mathematics
Q.

Let be a matrix such that

, , and .

If , then is equal to :

  1. A

    16

  2. B

    25

  3. C

    49

  4. D

    64

Solution

The action of on standard basis vectors gives us its columns. From , the third column is . Subtracting from , the first column is .

From , the third row is . Subtracting from , the first row is .

Hence for some unknown . Expanding gives , which simplifies to , so .

Computing , so with .

For a matrix, , so .

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