1.

Solve the following : [[2,2,x],[-1,x,4],[1,1,1]]=0

Answer»

SOLUTION :`[[2,2,x],[-1,x,4],[1,1,1]]`=0
or, `[[0,2+2x,x+8],[0,x+1,5],[1,1,1]]`=0
(REPLACING `R_1` and `R_2` by `R_1+2R_2` and `R_2+R_3`)
or, `1XX[[2+2x,x+8],[x+1,5]]`=0
or, `10+10x-x^2-8x-x-8=0`
or, `x^2-2x+x-2=0`
or, (x-2)(x+1)=0
`therefore` x=2,x=-1


Discussion

No Comment Found

Related InterviewSolutions