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प्रश्न
Using properties of determinants, prove that
`|((x+y)^2,zx,zy),(zx,(z+y)^2,xy),(zy,xy,(z+x)^2)|=2xyz(x+y+z)^3`
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उत्तर
`|((x+y)^2,zx,zy),(zx,(z+y)^2,xy),(zy,xy,(z+x)^2)|=2xyz(x+y+z)^3`
L.H.S.
Multipiying R1, R2 and R3 by z, x, y respectively
`=1/(xyz)|(z(x+y)^2,z^2x,z^2y),(x^2z,x(z+y)^2,x^2y),(y^2z,xy^2,y(z+x)^2)|`
take common z, x, y from C1, C2, & C3
`=(xyz)/(xyz)|((x+y)^2,z^2,z^2),(x^2,(z+y)^2,x^2),(y^2,y^2,(z+x)^2)|`
C1 → C1 - C3 and C2 C2 - C3
taking common x+y+z from C1 & C2
`=(x+y+z)^2|((x+y+z),0,z^2),(0,z+y-x,x^2),(y-z-x,y-z-x,(z+x)^2)|`
R3 → R3 - (R1 + R2)
`=(x+y+z)^2|(x+y+z,0,z^2),(0,z+y-x,x^2),(-2x,-2zx,2xz)|`
C1 → zC1, C2 → xC3
`=(x+y+z)^2/(xz)=|(z(x+y-z),0,z^2),(0,x(z+y-x),x^2),(-2xz,-2zx,2xz)|`
C1 → C1 + C3 C2 → C2 + C3
`=(x+y+x^2)/(xz)|(z(x+y),z^2,z^2),(x^2,x(z+y),x^2),(0,0,2xz)|`
taking z and x common from R1 & R2
`=(x+y+x)^2/(xz)xxzx|(x+y,z,z),(x,z+y,x),(0,0,2xz)|`
expansion along R3
= (x+y+z)2 × 2xz ((x + y) (z + y) – xz)
= (x+y+z)2 × 2xz (xz + xy + yz + y2 - xz)
= (x+y+z)2 × 2xz (xy + yz + y2)
= 2xyz (x + y + z)3
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