Q. 10 B4.3( 27 Votes )

By using properti

Answer :

R1 R1 + R2 + R3 (i.e. replace 1st row by addition of 1st, 2nd and 3rd row)


Taking 3y + k outside the determinant from 1st row



C2 C2 - C1 (i.e. replace 2nd column by subtraction of 2nd and 1st column)


C3 C3 - C1 (i.e. replace 3rd column by subtraction of 3rd and 1st column)



Expanding the determinant along 1st row



LHS = (3y + k) k2 = RHS



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