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If a,b,c are in A.P, find value of|[2y+4,5y+7,8y+a],[3y+5,6y+8,9y+b],[4y+6,7y+9,10y+c]|

Answer»

SOLUTION :Applying `R_1toR_1+R_3-2R_2` to the GIVEN DETERMINANT, we obtain
.|[0,0,0],[3y+5,6y+8,9y+b],[4y+6,7y+9,10y+c]|=0`(SINCE 2B = a+c)


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