1.

Consider the determinant Delta=|[0,2,6],[1,5,0],[3,7,1]|Write the co-factors of the elements in the first column. Hence, evaluate Delta

Answer»

SOLUTION :The co-factors are GIVEN below:
`A_11=(-1)^(1+1)M_11=1xx5=5,`
`A_21=(-1)^(2+1)M_21`
`=-1xx-40=40`
`A_31=(-1)^(3+1)M_31`
`=1xx-30=30`
`thereforeDelta=0xx5+1xx40+3xx-30`
`=0+40-90=-50`


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