1.

Let `A=[(l,m,n),(p,q,r),(1,1,1)]` and `B=A^(2)`. If `(l-m)^(2)+(p-q)^(2)=9, (m-n)^(2)+(q-r)^(2)=16, (n-l)^(2)+(r-p)^(2)=25`, then the value of `|det(B)-140|` is_______

Answer» Correct Answer - 4
`det(A)` is twice of area of triangle with vertices `(l,p), (m,q),(n,r)` with sides 3, 4,5
`Delta^(2)=s(s-a)(s-b)(s-c)`
`impliesDelta^(2)=6xx3xx2xx1`
`impliesDelta=6`
Now `det(A)=12`
`impliesdet(B)=144`


Discussion

No Comment Found

Related InterviewSolutions