1.

The matrices P[(u_(1),v_(1),w_(1)),(u_(2),v_(2),w_(2)),(u_(3),v_(3)w_(3))] and Q=(1)/(9)[(2,2,1),(12,-5,m),(-8,1,5)] are such that PQ=l, an identify matrix. Solving the equation [(u_(1),v_(1),w_(1)),(u_(2),v_(2),w_(2)),(u_(3),v_(3),w_(3))][(x),(y),(z)]=[(1),(1),(5)], the value of y comes out to be -3, then the value of m is equal to

Answer»

27
7
`-27`
`-7`

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