Question

plse can any one prove this

Answer 1

how the determinant changes when row 1 is multiplied by a scalar x?

Answer 2

Have you learnt about the relationship between row operations and determinant of a matrix ?

Answer 3

Then answer my above question: how the determinant changes when row 1 is multiplied by a scalar x?

Answer 4

ax, bx , x(ax+by)

Answer 5

Now, that doesn't address my question. Anyway, tell me what you've learnt about determinant and elementary row operations, as you said you know them.

Answer 6

If we apply row operation, we have to use like for example R1=R1+R2
and if we apply then we have to use column wise only

Answer 7

Have you learnt that if we add a multiple of row i to row j then the determinant remains unchanged?