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in Mathematics by (89.4k points)
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m के किस मान के लिए बिंदु, जिनके स्थिति सदिश क्रमश: `10hati+3hatj, 12hati-5hatj` तथा `mhati+11hatj` है संरेखीये होंगे?
A. `-8`
B. 8
C. 4
D. `-4`

1 Answer

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Correct Answer - B
सदिश `(10hati+3hatj),(12hati-5hatj)` तथा `(mhati+11hatj)` संरेखीये होंगे, यदि
`|{:(,10,3,1),(,12,-5,1),(,m,11,1):}|=0`
`Rightarrow |{:(,10,3,1),(,2,-8,0),(,m-10,8,0):}|=0" "[therefore R_(2)-R_(2)-R_(1),R_(3) to R_(3)-R_(1)]`
`Rightarrow 16+8m-80=0 Rightarrow 8m=64 Rightarrow m=8`

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