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The vertices of a triangle ABC are A (1,...

The vertices of a triangle ABC are A (1,-2, 2), B (1, 4, 0) and C (-4, 1, 1) respectively. If M be the foot of perpendicular drawn from B on AC, then `vec BM` is

Text Solution

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`tantheta=|(m_1-m_2)/(1+m_1m_2)|`
`tantheta=|((-3/4)+1)/(1+3/4)|`
`tantheta=1/7`
`tantheta=|(m+3/4)/(1-3/4m)|`
`1/7=|(4m+3)/(4-3m)|`
`1/7=(4m+3)/(4-3m)`
`m=-17/31,-1`
`3x+4y=5`
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