The equation for the line that goes through vector points A and B is
i - 5j - 7k + t(9i + 15j + 12k)
A is defined: i - 5j - 7k
B is defined: 10i + 10j + 5k
Find the position vector of point P such that OP is perpendicular to AB
The Attempt at a Solution
well a.b = 0 to be perpendicular
but how does that help...
Any ideas. My test is at 9am tomorrow (GMT). Can someone just explain the whole method for me.