Question bank/JEE Main/Mathematics
JEE MainMathematicsModerateStraight Lines
If P, Q and R are three points with co-ordinates (1,4), (4,2) and
[IMAGE] respectively then the value of m for which PR + RQ
is minimum will be equal to
Show answer and solution
[IMAGE] is a variable point lying on a line
[IMAGE] Now both points P and Q lie opposite side of line [IMAGE] Hence so PR + RQ will be minimum when PRQ are collinear.
[IMAGE] Now both points P and Q lie opposite side of line [IMAGE] Hence so PR + RQ will be minimum when PRQ are collinear.
Source: Grass-G / M-10 Mathematics Paper-1 30 Oct.docx
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