Matrices and Determinants 2 Question 18

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20. The determinant |xp+yxy yp+zyz 0xp+yyp+z|=0, if

======= ####20. The determinant |xp+yxyyp+zyz0xp+yyp+z|=0, if

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(a) x,y,z are in AP

(b) x,y,z are in GP

(c) x,y,z are in HP

(d) xy,yz,zx are in AP

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Answer:

Correct Answer: 20. (b)

Solution:

  1. Given, |xp+yxyyp+zyz0xp+yyp+z|=0

Applying C1C1(pC2+C3)

|0xy0yz(xp2+yp+yp+z)xp+yyp+z|=0(xp2+2yp+z)(xzy2)=0

 Either xp2+2yp+z=0 or y2=xz

x,y,z are in GP.



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