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If A-=(p,q,r) and B-=(p^('),q^('),r^('))...

If `A-=(p,q,r)` and `B-=(p^('),q^('),r^('))` are two points on the line `lamdax=muy=vz` and `OA=a,OB=b` where `O` is origin then the value of `(pp^(')+qq^(')+rr^('))` is equal to

A

`a+b`

B

`ab`

C

`sqrt(a^(2)-b^(2))`

D

`-ab`

Text Solution

Verified by Experts

The correct Answer is:
B, D

as `lamdax=muy=v4`
passing through origin
`overline(OA).overline(OB)=|overline(OA)|.|overline(OB)|.costheta(becausetheta=0,pi`
`|overline(OA).overline(OB)|=a.b`
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