3 and 4 .Determinants and Matrices
medium

નીચેની સુરેખ સમીકરણ સંહતિ  $2 x+3 y+2 z=9$ ; $3 x+2 y+2 z=9$  ;$x-y+4 z=8$

A

$\alpha+\beta^{2}+\gamma^{3}=12$ નું સમાધાન કરતો ઉકેલ $(\alpha, \beta, \gamma)$ છે.

B

અસંખ્ય ઉકેલો છે.

C

એક પણ ઉકેલ નથી.

D

અનન્ય ઉકેલ છે.

(JEE MAIN-2021)

Solution

$2 x+3 y+2 z=9….(1)$

$3 x+2 y+2 z=9….(2)$

$x-y+4 z=8….(3)$

$(1)-(2) \Rightarrow-x+y=0 \Rightarrow x-y=0$

from $(3) 4 z=8 \Rightarrow z=2$

from $(1)$ $2 x+3 y=5$

$\Rightarrow x=y=1$

$\therefore$ system has unique solution

Standard 12
Mathematics

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